subject:"\[Bug 2161309\] Re\: Backlight regression"

[Bug 2161309] Re: Backlight regression

2026-09-29 Thread Mazen

Confirming fix on Acer Nitro AN515-57 (Intel TigerLake-H UHD Graphics, i915 + 
NVIDIA RTX 3050 Ti hybrid).
Ubuntu 24.04, kernel 7.0.0-34-generic (linux-hwe-7.0).
6.17.0-40 worked, 7.0.0-2x/3x regressed.
Brightness keys work again on 7.0.0-34 and intel_backlight responds.
Suspend/resume: screen comes back on, brightness preserved (set to 50%, 
suspended, resumed, still 50% via intel_backlight).

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[Bug 2161309] Re: Backlight regression

2026-09-29 Thread Jose Navarro

I have tested the fix on my Dell Latitude 7490 running Ubuntu 24.04.

Hardware:

* Dell Latitude 7490
* Intel UHD Graphics 620

Kernel tested:

* 7.0.0-34-generic

Results:

* Brightness keys work correctly.
* GNOME brightness slider works correctly.
* The physical display brightness changes as expected.
* No `i915.enable_dpcd_backlight=0` kernel parameter is used.
* Suspend/resume works correctly, both when suspending from Ubuntu and using 
the keyboard.
* Brightness continues to work correctly after resume.
* A full reboot also works correctly.

I can confirm that the backlight regression is fixed on my Dell Latitude
7490 with 7.0.0-34-generic.

Thank you for fixing this issue.

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Re: [Bug 2161309] Re: Backlight regression

2026-09-29 Thread Craig Denson

after update to 7.0.0.34: no change on LG Gram laptop. brightness stuck 
on max.

$ hostnamectl



  Operating System: Ubuntu 26.04.1 LTS
  Kernel: Linux 7.0.0-34-generic
  Architecture: x86-64
  Hardware Vendor: LG Electronics
  Hardware Model: 16Z90SP-A.ADB8U1
  Hardware SKU: EVO
  Hardware Version: 0.1
  Firmware Version: M2ZI0450 X64
   Firmware Date: Mon 2024-06-10

On 9/16/26 08:51, Ubuntu Kernel Bot wrote:
> This bug is awaiting verification that the linux-xuantie/7.0.0-1006.6
> kernel in -proposed solves the problem. Please test the kernel and
> update this bug with the results. If the problem is solved, change the
> tag 'verification-needed-resolute-linux-xuantie' to 'verification-done-
> resolute-linux-xuantie'. If the problem still exists, change the tag
> 'verification-needed-resolute-linux-xuantie' to 'verification-failed-
> resolute-linux-xuantie'.
>
>
> If verification is not done by 5 working days from today, this fix will
> be dropped from the source code, and this bug will be closed.
>
>
> See https://wiki.ubuntu.com/Testing/EnableProposed for documentation how
> to enable and use -proposed. Thank you!
>
>
> ** Tags added: kernel-spammed-resolute-linux-xuantie-v2 
> verification-needed-resolute-linux-xuantie
>

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Re: [Bug 2161309] Re: Backlight regression

2026-09-21 Thread jpaulh

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[Bug 2161309] Re: Backlight regression

2026-09-20 Thread Xan Eos

I mentioned it on bug# 2161359, but I'll say it here as well. No Kernel
since 7.0.0-14 has had the backlight, nor its respective keys, working
properly on an LG Gram, 7.0.0-31 doesn't either.

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Re: [Bug 2161309] Re: Backlight regression

2026-09-19 Thread Craig Denson

I don't see linux-xuantie... in resolute-proposed. anything else I 
should look for?


On 9/16/26 08:51, Ubuntu Kernel Bot wrote:
> This bug is awaiting verification that the linux-xuantie/7.0.0-1006.6
> kernel in -proposed solves the problem. Please test the kernel and
> update this bug with the results. If the problem is solved, change the
> tag 'verification-needed-resolute-linux-xuantie' to 'verification-done-
> resolute-linux-xuantie'. If the problem still exists, change the tag
> 'verification-needed-resolute-linux-xuantie' to 'verification-failed-
> resolute-linux-xuantie'.
>
>
> If verification is not done by 5 working days from today, this fix will
> be dropped from the source code, and this bug will be closed.
>
>
> See https://wiki.ubuntu.com/Testing/EnableProposed for documentation how
> to enable and use -proposed. Thank you!
>
>
> ** Tags added: kernel-spammed-resolute-linux-xuantie-v2 
> verification-needed-resolute-linux-xuantie
>

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[Bug 2161309] Re: Backlight regression

2026-09-19 Thread Alessandro Armando

I tested kernel 7.0.0-31-generic (7.0.0-31.31) as requested, but the
problem persists on my Dell XPS 13 9340 with the Sharp C71M1 panel. The
brightness keys, the GNOME slider, and direct writes to
/sys/class/backlight/intel_backlight/brightness change the reported
brightness values, but the physical panel luminance remains unchanged.
Therefore, the fix for bug 2161309 does not resolve the issue on this
hardware configuration. Please reopen bug 2166520 or advise which
additional DRM/i915 diagnostics are required.

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Re: [Bug 2161309] Re: Backlight regression

2026-09-17 Thread Steven K

Backlight, screen blank on suspend fixed, Thank you.

 Static hostname: HpSpectre
   Icon name: computer-convertible
 Chassis: convertible
  Machine ID: 5f5e643290004105b47bd0d046cc935f
 Boot ID: a137b4546a8e40648f06a696717712c0
Operating System: Ubuntu 24.04.5 LTS
  Kernel: Linux 7.0.0-31-generic
Architecture: x86-64
 Hardware Vendor: HP
  Hardware Model: HP Spectre x360 Convertible 13-ac0XX
Firmware Version: F.52
   Firmware Date: Wed 2020-12-16
Firmware Age: 5y 9month 1d

On Fri, Aug 21, 2026 at 3:10 PM Pavol <[email protected]>
wrote:

> To fellow Ubuntu/Kubuntu users affected by this issue:
>
> As mentioned above, this bug is resolved starting with kernel version
> linux-image-7.0.0-31-generic.
>
> This fix is currently available in the `-proposed` repository for
> testing. Testing this pre-release build and providing your feedback here
> is very important for Canonical and Ubuntu developers—it helps them
> verify that the patch works reliably across different hardware
> configurations before releasing it to everyone in standard updates (and
> passing feedback upstream to the Linux kernel).
>
> If you are a regular user and run into any difficulties during the
> process, you can easily use modern AI tools (such as Gemini with
> reasoning enabled). If something goes wrong, simply copy the terminal
> output into the AI to analyze and guide you through the solution.
>
> Here is a step-by-step guide to safely install ONLY the proposed kernel
> without upgrading the rest of your system:
>
> ---
>
> ### Step 0: Check your system info (to include in your feedback comment)
> Run:
> hostnamectl
>
> ---
>
> ### Step 1: Enable the `-proposed` repository
> Open your terminal (e.g., Konsole) and run:
>
> SUITE=$(lsb_release -cs)
> sudo add-apt-repository -y "deb http://archive.ubuntu.com/ubuntu/
> ${SUITE}-proposed main restricted"
> sudo apt update
>
> ---
>
> ### Step 2: Install ONLY the new kernel from `-proposed`
> (Do NOT run `sudo apt upgrade`, as that would pull other untested system
> packages. Install only the kernel):
>
> sudo apt install -t ${SUITE}-proposed linux-image-generic linux-headers-
> generic
>
> (APT will automatically download the `...-31-generic` kernel image and
> all required modules).
>
> ---
>
> ### Step 3: Safely disable the `-proposed` repository
> Once the installation finishes, remove the proposed archive to keep your
> system stable:
>
> sudo add-apt-repository -r -y "deb http://archive.ubuntu.com/ubuntu/
> ${SUITE}-proposed main restricted"
> sudo apt update
>
> ---
>
> ### Step 4: Reboot and verify
> 1. Reboot your machine:
> sudo reboot
>
> 2. After booting, verify that you are running kernel version 31:
> uname -r
>
> ---
>
> If your brightness controls and suspend/resume are now working properly,
> please leave a comment with your hardware model (from `hostnamectl`) to
> confirm verification!
>
> --
> You received this bug notification because you are subscribed to a
> duplicate bug report (2162922).
> https://bugs.launchpad.net/bugs/2161309
>
> Title:
>   Backlight regression
>
> Status in linux package in Ubuntu:
>   Fix Committed
> Status in linux-hwe-7.0 package in Ubuntu:
>   Fix Committed
> Status in linux source package in Noble:
>   Invalid
> Status in linux-hwe-7.0 source package in Noble:
>   Fix Committed
> Status in linux source package in Resolute:
>   Fix Committed
> Status in linux-hwe-7.0 source package in Resolute:
>   Invalid
>
> Bug description:
>   -
>
>   Possible workaround until 7.0.0-31 kernel is released
>   Boot with i915.enable_dpcd_backlight=0 parameter
>
>   -
>
>
>   ThinkPad T480
>   Intel UHD 620
>   brightness works on 7.0.0-27
>   brightness fails on 7.0.0-28
>   /sys/class/backlight/intel_backlight changes but panel does not
>
>   ProblemType: Bug
>   DistroRelease: Ubuntu 26.04
>   Package: linux-image-7.0.0-27-generic 7.0.0-27.27
>   ProcVersionSignature: Ubuntu 7.0.0-27.27-generic 7.0.6
>   Uname: Linux 7.0.0-27-generic x86_64
>   ApportVersion: 2.34.0-0ubuntu2
>   Architecture: amd64
>   AudioDevicesInUse:
>USERPID ACCESS COMMAND
>/dev/snd/controlC0:  neal   3608 F wireplumber
>/dev/snd/seq:neal   3589 F pipewire
>   CasperMD5CheckResult: unknown
>   CurrentDesktop: ubuntu:GNOME
>   Date: Mon Jul 20 12:47:12 2026
>   InstallationDate: Installed on 2026-07-12 (8 days ago)
>   InstallationMedia: Ubuntu 26.04 "Resolute Raccoon" - Release amd64
> (20260423.1)
>   MachineType: LENOVO 20L6S6L601
>   ProcFB: 0 i915drmfb
>   ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-7.0.0-27-generic
> root=UUID=1cea3fcd-0665-4cb4-a85a-4ebc58d5aed0 ro quiet splash
> acpi_backlight=native
> crashkernel=2G-4G:320M,4G-32G:512M,32G-64G:1024M,64G-128G:2048M,128G-:4096M
>   SourcePackage: linux
>   UpgradeStatus: No upgrade log present (probably fresh install)
>   dmi.bios.date: 09/06/2025
>   dmi.bios.release: 1.56
>

[Bug 2161309] Re: Backlight regression

2026-09-17 Thread Ben P

Completely fixed for me too now, thank you.

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Re: [Bug 2161309] Re: Backlight regression

2026-09-16 Thread Ivan Poplavskii

I can confirm that the fix resolves the original backlight issue on my
hardware.

Verification details:
- Machine: HP Pavilion x360 Convertible 14-ba0xx
- GPU: Intel HD Graphics 610 [8086:5906]
- Ubuntu: 24.04 (Noble), amd64
- Running kernel: 7.0.0-31-generic
- Package version: 7.0.0-31.31~24.04.1

Brightness hotkeys and the GNOME brightness slider now change the
physical panel brightness normally. The original failure was
reproducible with 7.0.0-28-generic, where the software brightness
value changed but the physical backlight stayed dim.

No i915.enable_dpcd_backlight workaround is present on the current
kernel command line.

This verifies the Noble generic/HWE kernel fix for my duplicate report
#2163014. The linux-xuantie verification request does not apply to
this amd64 machine.

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[Bug 2161309] Re: Backlight regression

2026-09-16 Thread Zukrin

I reported duplicate bug #2165156 (Haswell i915 resume/black screen
regression).

I can confirm that the proposed fix resolves the issue for my hardware.

### Verification Details:
- **Hardware / Machine:** ASUS N56JN laptop (Intel Haswell Core i7-4710HQ / HD 
Graphics 4600)
- **Ubuntu Release:** Ubuntu 24.04
- **Tested Package / Kernel Version:** 7.0.0-31-generic from noble-proposed / 
kernel parameter "quiet splash mem_sleep_default=deep acpi_osi= 
acpi_backlight=native"

### Test Results:
- Prior behavior: Black screen / display failure upon resuming from S3 suspend 
with `assert_can_disable_lcpll` warnings in dmesg.
- New behavior: Multiple S3 suspend/resume cycles executed successfully. 
Display recovers immediately without black screen or driver stall.

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[Bug 2161309] Re: Backlight regression

2026-09-16 Thread Ubuntu Kernel Bot

This bug is awaiting verification that the linux-xuantie/7.0.0-1006.6
kernel in -proposed solves the problem. Please test the kernel and
update this bug with the results. If the problem is solved, change the
tag 'verification-needed-resolute-linux-xuantie' to 'verification-done-
resolute-linux-xuantie'. If the problem still exists, change the tag
'verification-needed-resolute-linux-xuantie' to 'verification-failed-
resolute-linux-xuantie'.


If verification is not done by 5 working days from today, this fix will
be dropped from the source code, and this bug will be closed.


See https://wiki.ubuntu.com/Testing/EnableProposed for documentation how
to enable and use -proposed. Thank you!


** Tags added: kernel-spammed-resolute-linux-xuantie-v2 
verification-needed-resolute-linux-xuantie

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[Bug 2161309] Re: Backlight regression

2026-09-04 Thread Krystian Kaniewski

** Changed in: linux (Ubuntu)
   Status: Fix Committed => Fix Released

** Changed in: linux-hwe-7.0 (Ubuntu)
   Status: Fix Committed => Fix Released

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[Bug 2161309] Re: Backlight regression

2026-09-03 Thread Launchpad Bug Tracker

This bug was fixed in the package linux-hwe-7.0 - 7.0.0-31.31~24.04.1

---
linux-hwe-7.0 (7.0.0-31.31~24.04.1) noble; urgency=medium

  * noble/linux-hwe-7.0: 7.0.0-31.31~24.04.1 -proposed tracker (LP:
#2162412)

  [ Ubuntu: 7.0.0-31.31 ]

  * resolute/linux: 7.0.0-31.31 -proposed tracker (LP: #2162413)
  * Backport: "firmware: arm_ffa: Respect firmware advertised RX/TX buffer
size limits" (LP: #2162012)
- firmware: arm_ffa: Respect firmware advertised RX/TX buffer size limits
  * Backlight regression (LP: #2161309)
- Revert "drm/i915/backlight: Remove try_vesa_interface"
  * Resolute real-time patchset: 7.0.1-rt2 (LP: #2161757)
- SAUCE: Reapply "serial: 8250: Switch to nbcon console"
- SAUCE: Reapply "serial: 8250: Revert "drop lockdep annotation from
  serial8250_clear_IER()""
- Real-time patchset 7.0.1-rt2
  * Delta_Ubuntu24.04_Ubuntu (Waston)_Suspend(S3) Stress Test Fail when the
A400 is on by remote controller . (LP: #2161385)
- SAUCE: drm/amd/display: Tear down dangling pipe on boot to fix s0i3
  * Camera output is vague and color is abnormal (LP: #2156972)
- media: intel/ipu6: Improve DWC PHY HSFREQRANGE band selection for
  overlapping ranges
  * [SRU] Fix incorrect boot_display reporting on multi-GPU systems
(LP: #2161036)
- x86/video: Only fall back to vga_default_device() without screen info
  * Backport: complete perf_allow_* trio and use in drm/xe (LP: #2160654)
- perf/core: out-of-line and export perf_allow_cpu/tracepoint()
- drm/xe: gate observation streams with perf_allow_cpu()
  * Fix noise of audio output on Dell Pro QCM1255 after reboot (LP: #2160666)
- ALSA: hda/realtek - Fixed Headphone noise issue for Dell QCM1255
  * Drop DEP-8 tests from kernel packages (LP: #2160302)
- [Packaging] Drop DEP-8 tests from kernel source
  * The screen will show garbages by running glxgears fullscreen.
(LP: #2158605)
- SAUCE: drm/xe/display: skip FORCE_WC and vm_bound check for external
  dma-bufs
  * Audio shows Dummy Output on systems with Cirrus Logic cs42l43 codec
(LP: #2156313)
- ASoC: sdw_utils: fix missing component_name for cs42l43 part_id 0x2A3B
  * TPM2 key creation commands time out on some Infineon modules
(LP: #2158883)
- tpm: restore timeout for key creation commands
  * Fix Mic Mute LED no function on HP EliteBook (LP: #2158860)
- ALSA: hda/realtek: Add LED fixup for HP EliteBook 6 G2i Laptops
  * Malformed HV_LINUX_VENDOR_ID breaks VM Availability Metric on Azure
(LP: #2158462)
- SAUCE: (no-up) hv: Fix supplied vendor ID
  * [SRU]Enable Realtek ALC287 + Cirrus CS35L56 Audio for Lenovo Yoga Pro 7
(LP: #2156867)
- ALSA: hda/realtek: ALC269 fixup for Lenovo Yoga Pro 7 15ASH111 audio
- ALSA: hda/realtek:ALC269 fixup for Yoga Pro 7 15ASH11 mic mute LED
- ASoC: amd: acp: Add DMI quirk for Lenovo Yoga Pro 7 15ASH11
  * iwlwifi failed to handle oversized command 0xC05 (LP: #2152688)
- wifi: iwlwifi: mld: add support for iwl_mcc_allowed_ap_type_cmd v2
- wifi: iwlwifi: mvm: avoid oversized UATS command copy
  * MT7925 wifi is hard blocked on Dell's machine (LP: #2158229)
- SAUCE: Revert "wifi: mt76: mt7925: add rfkill_poll for hardware rfkill"
  * Resolute update: upstream stable patchset 2026-07-21 (LP: #2161462)
- rust: str: use the "kernel vertical" imports style
- rust: str: clean unused import for Rust >= 1.98
- userfaultfd: gate must_wait writability check on pte_present()
- device property: initialize the remaining fields of fwnode_handle in
  fwnode_init()
- f2fs: fix potential deadlock in f2fs_balance_fs()
- f2fs: fix potential deadlock in gc_merge path of f2fs_balance_fs()
- f2fs: fix listxattr handling of corrupted xattr entries
- net/sched: dualpi2: fix GSO backlog accounting
- mm/khugepaged: write all dirty file folios when collapsing
- slab: recognize @GFP parameter as optional in kernel-doc
- perf trace beauty fcntl: Fix build with older kernel headers
- KVM: x86: Move update_cr8_intercept() to lapic.c
- KVM: VMX: Grab vmcs12 on CR8 interception update iff vCPU is in guest
  mode
- KVM: x86: Unconditionally recompute CR8 intercept on PPR update
- ACPI: CPPC: Suppress UBSAN warning caused by field misuse
- ACPI: NFIT: core: Fix possible NULL pointer dereference
- platform/x86: intel-hid: Protect ACPI notify handler against recursion
- LoongArch: Add PIO for early access before ACPI PCI root register
- rust: cpufreq: clean new `clippy::map_or_identity` lint for Rust 1.98.0
- rust: block: fix GenDisk cleanup paths
- rust: doctest: fix incorrect pattern in replacement
- rust: Kbuild: set frame-pointer llvm module flag for
  CONFIG_FRAME_POINTER
- futex/requeue: Revert "Prevent NULL pointer dereference in
  remove_waiter() on self-deadlock""
- perf/core: Detach event groups during remove_on_exec
- rust: kasan: KASAN+RUST

[Bug 2161309] Re: Backlight regression

2026-09-03 Thread Launchpad Bug Tracker

This bug was fixed in the package linux - 7.0.0-31.31

---
linux (7.0.0-31.31) resolute; urgency=medium

  * resolute/linux: 7.0.0-31.31 -proposed tracker (LP: #2162413)

  * Backport: "firmware: arm_ffa: Respect firmware advertised RX/TX buffer
size limits" (LP: #2162012)
- firmware: arm_ffa: Respect firmware advertised RX/TX buffer size limits

  * Backlight regression (LP: #2161309)
- Revert "drm/i915/backlight: Remove try_vesa_interface"

  * Resolute real-time patchset: 7.0.1-rt2 (LP: #2161757)
- SAUCE: Reapply "serial: 8250: Switch to nbcon console"
- SAUCE: Reapply "serial: 8250: Revert "drop lockdep annotation from
  serial8250_clear_IER()""
- Real-time patchset 7.0.1-rt2

  * Delta_Ubuntu24.04_Ubuntu (Waston)_Suspend(S3) Stress Test Fail when the
A400 is on by remote controller . (LP: #2161385)
- SAUCE: drm/amd/display: Tear down dangling pipe on boot to fix s0i3

  * Camera output is vague and color is abnormal (LP: #2156972)
- media: intel/ipu6: Improve DWC PHY HSFREQRANGE band selection for
  overlapping ranges

  * [SRU] Fix incorrect boot_display reporting on multi-GPU systems
(LP: #2161036)
- x86/video: Only fall back to vga_default_device() without screen info

  * Backport: complete perf_allow_* trio and use in drm/xe (LP: #2160654)
- perf/core: out-of-line and export perf_allow_cpu/tracepoint()
- drm/xe: gate observation streams with perf_allow_cpu()

  * Fix noise of audio output on Dell Pro QCM1255 after reboot (LP: #2160666)
- ALSA: hda/realtek - Fixed Headphone noise issue for Dell QCM1255

  * Drop DEP-8 tests from kernel packages (LP: #2160302)
- [Packaging] Drop DEP-8 tests from kernel source

  * The screen will show garbages by running glxgears fullscreen.
(LP: #2158605)
- SAUCE: drm/xe/display: skip FORCE_WC and vm_bound check for external
  dma-bufs

  * Audio shows Dummy Output on systems with Cirrus Logic cs42l43 codec
(LP: #2156313)
- ASoC: sdw_utils: fix missing component_name for cs42l43 part_id 0x2A3B

  * TPM2 key creation commands time out on some Infineon modules
(LP: #2158883)
- tpm: restore timeout for key creation commands

  * Fix Mic Mute LED no function on HP EliteBook (LP: #2158860)
- ALSA: hda/realtek: Add LED fixup for HP EliteBook 6 G2i Laptops

  * Malformed HV_LINUX_VENDOR_ID breaks VM Availability Metric on Azure
(LP: #2158462)
- SAUCE: (no-up) hv: Fix supplied vendor ID

  * [SRU]Enable Realtek ALC287 + Cirrus CS35L56 Audio for Lenovo Yoga Pro 7
(LP: #2156867)
- ALSA: hda/realtek: ALC269 fixup for Lenovo Yoga Pro 7 15ASH111 audio
- ALSA: hda/realtek:ALC269 fixup for Yoga Pro 7 15ASH11 mic mute LED
- ASoC: amd: acp: Add DMI quirk for Lenovo Yoga Pro 7 15ASH11

  * iwlwifi failed to handle oversized command 0xC05 (LP: #2152688)
- wifi: iwlwifi: mld: add support for iwl_mcc_allowed_ap_type_cmd v2
- wifi: iwlwifi: mvm: avoid oversized UATS command copy

  * MT7925 wifi is hard blocked on Dell's machine (LP: #2158229)
- SAUCE: Revert "wifi: mt76: mt7925: add rfkill_poll for hardware rfkill"

  * Resolute update: upstream stable patchset 2026-07-21 (LP: #2161462)
- rust: str: use the "kernel vertical" imports style
- rust: str: clean unused import for Rust >= 1.98
- userfaultfd: gate must_wait writability check on pte_present()
- device property: initialize the remaining fields of fwnode_handle in
  fwnode_init()
- f2fs: fix potential deadlock in f2fs_balance_fs()
- f2fs: fix potential deadlock in gc_merge path of f2fs_balance_fs()
- f2fs: fix listxattr handling of corrupted xattr entries
- net/sched: dualpi2: fix GSO backlog accounting
- mm/khugepaged: write all dirty file folios when collapsing
- slab: recognize @GFP parameter as optional in kernel-doc
- perf trace beauty fcntl: Fix build with older kernel headers
- KVM: x86: Move update_cr8_intercept() to lapic.c
- KVM: VMX: Grab vmcs12 on CR8 interception update iff vCPU is in guest
  mode
- KVM: x86: Unconditionally recompute CR8 intercept on PPR update
- ACPI: CPPC: Suppress UBSAN warning caused by field misuse
- ACPI: NFIT: core: Fix possible NULL pointer dereference
- platform/x86: intel-hid: Protect ACPI notify handler against recursion
- LoongArch: Add PIO for early access before ACPI PCI root register
- rust: cpufreq: clean new `clippy::map_or_identity` lint for Rust 1.98.0
- rust: block: fix GenDisk cleanup paths
- rust: doctest: fix incorrect pattern in replacement
- rust: Kbuild: set frame-pointer llvm module flag for
  CONFIG_FRAME_POINTER
- futex/requeue: Revert "Prevent NULL pointer dereference in
  remove_waiter() on self-deadlock""
- perf/core: Detach event groups during remove_on_exec
- rust: kasan: KASAN+RUST requires clang
- fscrypt: Replace mk_users keyring with simple list
- usb: gadget: function: rndis: add length

Re: [Bug 2161309] Re: Backlight regression

2026-08-27 Thread Craig Denson

yes, no dice

On August 27, 2026 10:41:34 AM PDT, Daniel Letzeisen 
<[email protected]> wrote:
>@Craig:
>Di you try the -31 kernel without any extra parameters (i.e. get rid of 
>i915.enable_dpcd_backlight=0 ) ?
>
>-- 
>You received this bug notification because you are subscribed to a
>duplicate bug report (2163518).
>https://bugs.launchpad.net/bugs/2161309
>
>Title:
>  Backlight regression
>
>Status in linux package in Ubuntu:
>  Fix Committed
>Status in linux-hwe-7.0 package in Ubuntu:
>  Fix Committed
>Status in linux source package in Noble:
>  Invalid
>Status in linux-hwe-7.0 source package in Noble:
>  Fix Committed
>Status in linux source package in Resolute:
>  Fix Committed
>Status in linux-hwe-7.0 source package in Resolute:
>  Invalid
>
>Bug description:
>  -
>
>  Possible workaround until 7.0.0-31 kernel is released
>  Boot with i915.enable_dpcd_backlight=0 parameter
>
>  -
>
>  ThinkPad T480
>  Intel UHD 620
>  brightness works on 7.0.0-27
>  brightness fails on 7.0.0-28
>  /sys/class/backlight/intel_backlight changes but panel does not
>
>  ProblemType: Bug
>  DistroRelease: Ubuntu 26.04
>  Package: linux-image-7.0.0-27-generic 7.0.0-27.27
>  ProcVersionSignature: Ubuntu 7.0.0-27.27-generic 7.0.6
>  Uname: Linux 7.0.0-27-generic x86_64
>  ApportVersion: 2.34.0-0ubuntu2
>  Architecture: amd64
>  AudioDevicesInUse:
>   USERPID ACCESS COMMAND
>   /dev/snd/controlC0:  neal   3608 F wireplumber
>   /dev/snd/seq:neal   3589 F pipewire
>  CasperMD5CheckResult: unknown
>  CurrentDesktop: ubuntu:GNOME
>  Date: Mon Jul 20 12:47:12 2026
>  InstallationDate: Installed on 2026-07-12 (8 days ago)
>  InstallationMedia: Ubuntu 26.04 "Resolute Raccoon" - Release amd64 
> (20260423.1)
>  MachineType: LENOVO 20L6S6L601
>  ProcFB: 0 i915drmfb
>  ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-7.0.0-27-generic 
> root=UUID=1cea3fcd-0665-4cb4-a85a-4ebc58d5aed0 ro quiet splash 
> acpi_backlight=native 
> crashkernel=2G-4G:320M,4G-32G:512M,32G-64G:1024M,64G-128G:2048M,128G-:4096M
>  SourcePackage: linux
>  UpgradeStatus: No upgrade log present (probably fresh install)
>  dmi.bios.date: 09/06/2025
>  dmi.bios.release: 1.56
>  dmi.bios.vendor: LENOVO
>  dmi.bios.version: N24ET81W (1.56 )
>  dmi.board.asset.tag: Not Available
>  dmi.board.name: 20L6S6L601
>  dmi.board.vendor: LENOVO
>  dmi.board.version: SDK0J40697 WIN
>  dmi.chassis.asset.tag: No Asset Information
>  dmi.chassis.type: 10
>  dmi.chassis.vendor: LENOVO
>  dmi.chassis.version: None
>  dmi.ec.firmware.release: 1.22
>  dmi.modalias: 
> dmi:bvnLENOVO:bvrN24ET81W(1.56):bd09/06/2025:br1.56:efr1.22:svnLENOVO:pn20L6S6L601:pvrThinkPadT480:rvnLENOVO:rn20L6S6L601:rvrSDK0J40697WIN:cvnLENOVO:ct10:cvrNone:skuLENOVO_MT_20L6_BU_Think_FM_ThinkPadT480:pfaThinkPadT480:
>  dmi.product.family: ThinkPad T480
>  dmi.product.name: 20L6S6L601
>  dmi.product.sku: LENOVO_MT_20L6_BU_Think_FM_ThinkPad T480
>  dmi.product.version: ThinkPad T480
>  dmi.sys.vendor: LENOVO
>
>To manage notifications about this bug go to:
>https://bugs.launchpad.net/ubuntu/+source/linux/+bug/2161309/+subscriptions
>

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[Bug 2161309] Re: Backlight regression

2026-08-27 Thread Daniel Letzeisen

@Craig:
Di you try the -31 kernel without any extra parameters (i.e. get rid of 
i915.enable_dpcd_backlight=0 ) ?

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Re: [Bug 2161309] Re: Backlight regression

2026-08-27 Thread Craig Denson

still no-workee, for me.  brightness stuck on max


  Operating System: Ubuntu 26.04.1 LTS
  Kernel: Linux 7.0.0-31-generic
   Architecture: x86-64
   Hardware Vendor: LG Electronics
   Hardware Model: 16Z90SP-A.ADB8U1
   Hardware SKU: EVO
  Hardware Version: 0.1
  Firmware Version: M2ZI0450 X64
  Firmware Date: Mon 2024-06-10
   Firmware Age: 2y 2month 2w 3d

  /proc/cmdline
BOOT_IMAGE=/boot/vmlinuz-7.0.0-31-generic 
root=UUID=189cd51c-c163-40fb-a648-e6634b454c51 ro 
i915.enable_dpcd_backlight=0 quiet splash

also tried

/proc/cmdline
BOOT_IMAGE=/boot/vmlinuz-7.0.0-31-generic 
root=UUID=189cd51c-c163-40fb-a648-e6634b454c51 ro acpi_backlight=native 
i915.enable_dpcd_backlight=0 quiet splash

craig

On 8/25/26 10:34, Ubuntu Kernel Bot wrote:
> This bug is awaiting verification that the linux-fips/7.0.0-31.31+fips1
> kernel in -proposed solves the problem. Please test the kernel and
> update this bug with the results. If the problem is solved, change the
> tag 'verification-needed-resolute-linux-fips' to 'verification-done-
> resolute-linux-fips'. If the problem still exists, change the tag
> 'verification-needed-resolute-linux-fips' to 'verification-failed-
> resolute-linux-fips'.
>
>
> If verification is not done by 5 working days from today, this fix will
> be dropped from the source code, and this bug will be closed.
>
>
> Seehttps://wiki.ubuntu.com/Testing/EnableProposed for documentation how
> to enable and use -proposed. Thank you!
>
>
> ** Tags added: kernel-spammed-resolute-linux-fips-v2 
> verification-needed-resolute-linux-fips
>

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[Bug 2161309] Re: Backlight regression

2026-08-27 Thread Boussard Jean-Marie

** Tags added: verification-done-noble

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[Bug 2161309] Re: Backlight regression

2026-08-27 Thread Boussard Jean-Marie

This fix works for me.

System: ASUS X302LA, Linux Mint 22.3 (based on Ubuntu 24.04 Noble)

Symptoms with kernel 7.0.0-28-generic:

Brightness keys had no effect
No backlight after resuming from suspend (black screen)

Workaround used prior to testing the fix: adding
i915.enable_dpcd_backlight=0 to the GRUB kernel command line restored
normal behavior.

Testing method: proposed pocket not enabled via apt/sources.list;
instead, manually downloaded and installed the following packages from
this bug's Launchpad page via dpkg:

linux-hwe-7.0-headers-7.0.0-31 (15 MB)
linux-headers-7.0.0-31-generic (4.0 MB)
linux-image-7.0.0-31-generic (16 MB)
linux-modules-7.0.0-31-generic (161 MB)

Result: Booted into kernel 7.0.0-31-generic without the
i915.enable_dpcd_backlight=0 workaround. Brightness keys work correctly
and backlight resumes normally after suspend. Re-tested kernel
7.0.0-28-generic (workaround removed) to confirm the regression is still
present there, ruling out any coincidence.

tags: verification-done-noble

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Re: [Bug 2161309] Re: Backlight regression

2026-08-26 Thread wildlux

in kernel 7.2 it's fixed in kubuntu + update kernel it's ok now

Portfolio on Linkedin 


Il giorno mer 26 ago 2026 alle ore 09:00 Anubhav <[email protected]>
ha scritto:

> Tested on Lenovo ThinkPad T450 with kernel 7.0.0-31-generic. Display
> screen brightness keys and OS slider are working properly again.
>
> ** Tags removed: verification-needed-resolute-linux-fips
> ** Tags added: verification-done-resolute-linux-fips
>
> --
> You received this bug notification because you are subscribed to a
> duplicate bug report (2161151).
> https://bugs.launchpad.net/bugs/2161309
>
> Title:
>   Backlight regression
>
> To manage notifications about this bug go to:
> https://bugs.launchpad.net/ubuntu/+source/linux/+bug/2161309/+subscriptions
>
>

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[Bug 2161309] Re: Backlight regression

2026-08-26 Thread Anubhav

Tested on Lenovo ThinkPad T450 with kernel 7.0.0-31-generic. Display
screen brightness keys and OS slider are working properly again.

** Tags removed: verification-needed-resolute-linux-fips
** Tags added: verification-done-resolute-linux-fips

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[Bug 2161309] Re: Backlight regression

2026-08-25 Thread Ubuntu Kernel Bot

This bug is awaiting verification that the linux-fips/7.0.0-31.31+fips1
kernel in -proposed solves the problem. Please test the kernel and
update this bug with the results. If the problem is solved, change the
tag 'verification-needed-resolute-linux-fips' to 'verification-done-
resolute-linux-fips'. If the problem still exists, change the tag
'verification-needed-resolute-linux-fips' to 'verification-failed-
resolute-linux-fips'.


If verification is not done by 5 working days from today, this fix will
be dropped from the source code, and this bug will be closed.


See https://wiki.ubuntu.com/Testing/EnableProposed for documentation how
to enable and use -proposed. Thank you!


** Tags added: kernel-spammed-resolute-linux-fips-v2 
verification-needed-resolute-linux-fips

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[Bug 2161309] Re: Backlight regression

2026-08-25 Thread Tech Ping

** Description changed:

  -
  
- Possible workaround until 7.0.0-31 kernel is released 
+ Possible workaround until 7.0.0-31 kernel is released
  Boot with i915.enable_dpcd_backlight=0 parameter
  
  -
- 
  
  ThinkPad T480
  Intel UHD 620
  brightness works on 7.0.0-27
  brightness fails on 7.0.0-28
  /sys/class/backlight/intel_backlight changes but panel does not
  
  ProblemType: Bug
  DistroRelease: Ubuntu 26.04
  Package: linux-image-7.0.0-27-generic 7.0.0-27.27
  ProcVersionSignature: Ubuntu 7.0.0-27.27-generic 7.0.6
  Uname: Linux 7.0.0-27-generic x86_64
  ApportVersion: 2.34.0-0ubuntu2
  Architecture: amd64
  AudioDevicesInUse:
   USERPID ACCESS COMMAND
   /dev/snd/controlC0:  neal   3608 F wireplumber
   /dev/snd/seq:neal   3589 F pipewire
  CasperMD5CheckResult: unknown
  CurrentDesktop: ubuntu:GNOME
  Date: Mon Jul 20 12:47:12 2026
  InstallationDate: Installed on 2026-07-12 (8 days ago)
  InstallationMedia: Ubuntu 26.04 "Resolute Raccoon" - Release amd64 
(20260423.1)
  MachineType: LENOVO 20L6S6L601
  ProcFB: 0 i915drmfb
  ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-7.0.0-27-generic 
root=UUID=1cea3fcd-0665-4cb4-a85a-4ebc58d5aed0 ro quiet splash 
acpi_backlight=native 
crashkernel=2G-4G:320M,4G-32G:512M,32G-64G:1024M,64G-128G:2048M,128G-:4096M
  SourcePackage: linux
  UpgradeStatus: No upgrade log present (probably fresh install)
  dmi.bios.date: 09/06/2025
  dmi.bios.release: 1.56
  dmi.bios.vendor: LENOVO
  dmi.bios.version: N24ET81W (1.56 )
  dmi.board.asset.tag: Not Available
  dmi.board.name: 20L6S6L601
  dmi.board.vendor: LENOVO
  dmi.board.version: SDK0J40697 WIN
  dmi.chassis.asset.tag: No Asset Information
  dmi.chassis.type: 10
  dmi.chassis.vendor: LENOVO
  dmi.chassis.version: None
  dmi.ec.firmware.release: 1.22
  dmi.modalias: 
dmi:bvnLENOVO:bvrN24ET81W(1.56):bd09/06/2025:br1.56:efr1.22:svnLENOVO:pn20L6S6L601:pvrThinkPadT480:rvnLENOVO:rn20L6S6L601:rvrSDK0J40697WIN:cvnLENOVO:ct10:cvrNone:skuLENOVO_MT_20L6_BU_Think_FM_ThinkPadT480:pfaThinkPadT480:
  dmi.product.family: ThinkPad T480
  dmi.product.name: 20L6S6L601
  dmi.product.sku: LENOVO_MT_20L6_BU_Think_FM_ThinkPad T480
  dmi.product.version: ThinkPad T480
  dmi.sys.vendor: LENOVO

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[Bug 2161309] Re: Backlight regression

2026-08-24 Thread Violet Koss

I could not update to kernel version 7.0.0-31-generic, nor any other
kernel, due to errors, but adding the boot parameter
i915.enable_dpcd_backlight=0 did help without having to change the
kernel. I can confirm this helped resolve the issue of my laptop's
brightness not working and being dark after waking up from suspend.

 Static hostname: ThinkPad
   Icon name: computer-laptop
 Chassis: laptop 💻
  Machine ID: a6ba9d17a1db40b399de25da9ef40fc7
 Boot ID: b27dd49b5808496a97720ad90b45f631
Operating System: Ubuntu 24.04.4 LTS  
  Kernel: Linux 7.0.0-30-generic
Architecture: x86-64
 Hardware Vendor: Lenovo
  Hardware Model: ThinkPad X280
Firmware Version: N20ET74W (1.59 )
   Firmware Date: Tue 2025-08-26
Firmware Age: 11month 4w 1d

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[Bug 2161309] Re: Backlight regression

2026-08-22 Thread S Egan

Huge shoutout to Pavol https://launchpad.net/~pritel for the write-up
above! My brightness control/no backlight on resume regression is
resolved via 7.0.0-31-generic.

  Static hostname: T440s
Icon name: computer-laptop
  Chassis: laptop 💻
Chassis Asset Tag: 0784298
   Machine ID: d1af1390ca54421588509eed4368da40
  Boot ID: a9e5fb791e6c4b20a7d4d1ef5c4e9859
 Operating System: Ubuntu 26.04 LTS 
   Kernel: Linux 7.0.0-31-generic
 Architecture: x86-64
  Hardware Vendor: Lenovo
   Hardware Model: ThinkPad T440s
 Hardware SKU: LENOVO_MT_20AR_BU_Think_FM_ThinkPad T440s
 Firmware Version: GJET67WW (2.17 )
Firmware Date: Tue 2013-12-10
 Firmware Age: 12y 8month 1w 5d

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[Bug 2161309] Re: Backlight regression

2026-08-22 Thread JORGETECH

The brightness issue was solved in my end with the latest proposed kernel 
(7.0.0-31-generic). Here's the info of my system:
 
   Kernel: Linux 7.0.0-31-generic
 Architecture: x86-64
  Hardware Vendor: Lenovo
   Hardware Model: ThinkPad X250
 Hardware SKU: LENOVO_MT_20CL_BU_Think_FM_ThinkPad X250
 Firmware Version: N10ET63W (1.42 )
Firmware Date: Thu 2021-07-29
 Firmware Age: 5y 3w 3d

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Re: [Bug 2161309] Re: Backlight regression

2026-08-21 Thread Craig Denson

While I may have screwed up something , I think I'm running 
7.0.0-31-generic and there is no difference, still stuck on max brightness:

$ hostnamectl
   Static hostname: Cirrus
   Icon name: computer-laptop
   Chassis: laptop 💻

  Operating System: Ubuntu 26.04 LTS
  Kernel: Linux 7.0.0-31-generic
  Architecture: x86-64
  Hardware Vendor: LG Electronics
  Hardware Model: 16Z90SP-A.ADB8U1
   Hardware SKU: EVO
  Hardware Version: 0.1
  Firmware Version: M2ZI0450 X64
  Firmware Date: Mon 2024-06-10
  Firmware Age: 2y 2mont

After installing 7.0.0-31-generic - it kept booting the 
7.0.0-2018-nvidia-bos kernel. I removed it anyway with apt and killed my 
machine. editing the grub boot parameters by hand seems to have worked, 
but I trust nothing now.

audio down/up keys still work fine.

On 8/21/26 14:04, Pavol wrote:
> To fellow Ubuntu/Kubuntu users affected by this issue:
>
> As mentioned above, this bug is resolved starting with kernel version
> linux-image-7.0.0-31-generic.
>
> This fix is currently available in the `-proposed` repository for
> testing. Testing this pre-release build and providing your feedback here
> is very important for Canonical and Ubuntu developers—it helps them
> verify that the patch works reliably across different hardware
> configurations before releasing it to everyone in standard updates (and
> passing feedback upstream to the Linux kernel).
>
> If you are a regular user and run into any difficulties during the
> process, you can easily use modern AI tools (such as Gemini with
> reasoning enabled). If something goes wrong, simply copy the terminal
> output into the AI to analyze and guide you through the solution.
>
> Here is a step-by-step guide to safely install ONLY the proposed kernel
> without upgrading the rest of your system:
>
> ---
>
> ### Step 0: Check your system info (to include in your feedback comment)
> Run:
> hostnamectl
>
> ---
>
> ### Step 1: Enable the `-proposed` repository
> Open your terminal (e.g., Konsole) and run:
>
> SUITE=$(lsb_release -cs)
> sudo add-apt-repository -y "deb http://archive.ubuntu.com/ubuntu/ 
> ${SUITE}-proposed main restricted"
> sudo apt update
>
> ---
>
> ### Step 2: Install ONLY the new kernel from `-proposed`
> (Do NOT run `sudo apt upgrade`, as that would pull other untested system 
> packages. Install only the kernel):
>
> sudo apt install -t ${SUITE}-proposed linux-image-generic linux-headers-
> generic
>
> (APT will automatically download the `...-31-generic` kernel image and
> all required modules).
>
> ---
>
> ### Step 3: Safely disable the `-proposed` repository
> Once the installation finishes, remove the proposed archive to keep your 
> system stable:
>
> sudo add-apt-repository -r -y "deb http://archive.ubuntu.com/ubuntu/ 
> ${SUITE}-proposed main restricted"
> sudo apt update
>
> ---
>
> ### Step 4: Reboot and verify
> 1. Reboot your machine:
> sudo reboot
>
> 2. After booting, verify that you are running kernel version 31:
> uname -r
>
> ---
>
> If your brightness controls and suspend/resume are now working properly,
> please leave a comment with your hardware model (from `hostnamectl`) to
> confirm verification!
>

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Title:
  Backlight regression

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Re: [Bug 2161309] Re: Backlight regression

2026-08-21 Thread Olaniyi Ifeoluwa Oluwafayosi

Well done. It now works on my HP ZBook Studio G4

On Sat, Aug 22, 2026 at 12:05 AM Mike Stroyan <[email protected]>
wrote:

> This corrected backlight controlfor my Samsung 940X laptop with kernel
> version linux-image-7.0.0-31-generic.  That is the hardware config
> listed in https://bugs.launchpad.net/bugs/2161359 .
>
> --
> You received this bug notification because you are subscribed to a
> duplicate bug report (2162386).
> https://bugs.launchpad.net/bugs/2161309
>
> Title:
>   Backlight regression
>
> Status in linux package in Ubuntu:
>   Fix Committed
> Status in linux-hwe-7.0 package in Ubuntu:
>   Fix Committed
> Status in linux source package in Noble:
>   Invalid
> Status in linux-hwe-7.0 source package in Noble:
>   Fix Committed
> Status in linux source package in Resolute:
>   Fix Committed
> Status in linux-hwe-7.0 source package in Resolute:
>   Invalid
>
> Bug description:
>   -
>
>   Possible workaround until 7.0.0-31 kernel is released
>   Boot with i915.enable_dpcd_backlight=0 parameter
>
>   -
>
>
>   ThinkPad T480
>   Intel UHD 620
>   brightness works on 7.0.0-27
>   brightness fails on 7.0.0-28
>   /sys/class/backlight/intel_backlight changes but panel does not
>
>   ProblemType: Bug
>   DistroRelease: Ubuntu 26.04
>   Package: linux-image-7.0.0-27-generic 7.0.0-27.27
>   ProcVersionSignature: Ubuntu 7.0.0-27.27-generic 7.0.6
>   Uname: Linux 7.0.0-27-generic x86_64
>   ApportVersion: 2.34.0-0ubuntu2
>   Architecture: amd64
>   AudioDevicesInUse:
>USERPID ACCESS COMMAND
>/dev/snd/controlC0:  neal   3608 F wireplumber
>/dev/snd/seq:neal   3589 F pipewire
>   CasperMD5CheckResult: unknown
>   CurrentDesktop: ubuntu:GNOME
>   Date: Mon Jul 20 12:47:12 2026
>   InstallationDate: Installed on 2026-07-12 (8 days ago)
>   InstallationMedia: Ubuntu 26.04 "Resolute Raccoon" - Release amd64
> (20260423.1)
>   MachineType: LENOVO 20L6S6L601
>   ProcFB: 0 i915drmfb
>   ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-7.0.0-27-generic
> root=UUID=1cea3fcd-0665-4cb4-a85a-4ebc58d5aed0 ro quiet splash
> acpi_backlight=native
> crashkernel=2G-4G:320M,4G-32G:512M,32G-64G:1024M,64G-128G:2048M,128G-:4096M
>   SourcePackage: linux
>   UpgradeStatus: No upgrade log present (probably fresh install)
>   dmi.bios.date: 09/06/2025
>   dmi.bios.release: 1.56
>   dmi.bios.vendor: LENOVO
>   dmi.bios.version: N24ET81W (1.56 )
>   dmi.board.asset.tag: Not Available
>   dmi.board.name: 20L6S6L601
>   dmi.board.vendor: LENOVO
>   dmi.board.version: SDK0J40697 WIN
>   dmi.chassis.asset.tag: No Asset Information
>   dmi.chassis.type: 10
>   dmi.chassis.vendor: LENOVO
>   dmi.chassis.version: None
>   dmi.ec.firmware.release: 1.22
>   dmi.modalias:
> dmi:bvnLENOVO:bvrN24ET81W(1.56):bd09/06/2025:br1.56:efr1.22:svnLENOVO:pn20L6S6L601:pvrThinkPadT480:rvnLENOVO:rn20L6S6L601:rvrSDK0J40697WIN:cvnLENOVO:ct10:cvrNone:skuLENOVO_MT_20L6_BU_Think_FM_ThinkPadT480:pfaThinkPadT480:
>   dmi.product.family: ThinkPad T480
>   dmi.product.name: 20L6S6L601
>   dmi.product.sku: LENOVO_MT_20L6_BU_Think_FM_ThinkPad T480
>   dmi.product.version: ThinkPad T480
>   dmi.sys.vendor: LENOVO
>
> To manage notifications about this bug go to:
> https://bugs.launchpad.net/ubuntu/+source/linux/+bug/2161309/+subscriptions
>
>

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Title:
  Backlight regression

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[Bug 2161309] Re: Backlight regression

2026-08-21 Thread Mike Stroyan

This corrected backlight controlfor my Samsung 940X laptop with kernel
version linux-image-7.0.0-31-generic.  That is the hardware config
listed in https://bugs.launchpad.net/bugs/2161359 .

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  Backlight regression

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[Bug 2161309] Re: Backlight regression

2026-08-21 Thread Pavol

To fellow Ubuntu/Kubuntu users affected by this issue:

As mentioned above, this bug is resolved starting with kernel version
linux-image-7.0.0-31-generic.

This fix is currently available in the `-proposed` repository for
testing. Testing this pre-release build and providing your feedback here
is very important for Canonical and Ubuntu developers—it helps them
verify that the patch works reliably across different hardware
configurations before releasing it to everyone in standard updates (and
passing feedback upstream to the Linux kernel).

If you are a regular user and run into any difficulties during the
process, you can easily use modern AI tools (such as Gemini with
reasoning enabled). If something goes wrong, simply copy the terminal
output into the AI to analyze and guide you through the solution.

Here is a step-by-step guide to safely install ONLY the proposed kernel
without upgrading the rest of your system:

---

### Step 0: Check your system info (to include in your feedback comment)
Run:
hostnamectl

---

### Step 1: Enable the `-proposed` repository
Open your terminal (e.g., Konsole) and run:

SUITE=$(lsb_release -cs)
sudo add-apt-repository -y "deb http://archive.ubuntu.com/ubuntu/ 
${SUITE}-proposed main restricted"
sudo apt update

---

### Step 2: Install ONLY the new kernel from `-proposed`
(Do NOT run `sudo apt upgrade`, as that would pull other untested system 
packages. Install only the kernel):

sudo apt install -t ${SUITE}-proposed linux-image-generic linux-headers-
generic

(APT will automatically download the `...-31-generic` kernel image and
all required modules).

---

### Step 3: Safely disable the `-proposed` repository
Once the installation finishes, remove the proposed archive to keep your system 
stable:

sudo add-apt-repository -r -y "deb http://archive.ubuntu.com/ubuntu/ 
${SUITE}-proposed main restricted"
sudo apt update

---

### Step 4: Reboot and verify
1. Reboot your machine:
sudo reboot

2. After booting, verify that you are running kernel version 31:
uname -r

---

If your brightness controls and suspend/resume are now working properly,
please leave a comment with your hardware model (from `hostnamectl`) to
confirm verification!

-- 
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https://bugs.launchpad.net/bugs/2161309

Title:
  Backlight regression

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Re: [Bug 2161309] Re: Backlight regression

2026-08-21 Thread Steven K

Issue is not fixed in 7.0 for my device. Going back to 6.17.0-35-generic

verification-failed-resolute-linux-nvidia-bos

On Wed, Aug 19, 2026 at 12:30 PM Prince Benedict Wachira <
[email protected]> wrote:

> Ohh I wanted to inform the necessary parties that I was able to fix my
> earlier started issue. Thanks for the feedback
>
> On Wed, 19 Aug 2026 at 19:01, Krystian Kaniewski <
> [email protected]>
> wrote:
>
> > ** Also affects: linux (Ubuntu Resolute)
> >Importance: Undecided
> >Status: New
> >
> > ** Also affects: linux-hwe-7.0 (Ubuntu Resolute)
> >Importance: Undecided
> >Status: New
> >
> > ** Also affects: linux (Ubuntu Noble)
> >Importance: Undecided
> >Status: New
> >
> > ** Also affects: linux-hwe-7.0 (Ubuntu Noble)
> >Importance: Undecided
> >Status: New
> >
> > ** Changed in: linux (Ubuntu Resolute)
> >Status: New => Fix Committed
> >
> > ** Changed in: linux (Ubuntu Resolute)
> >  Assignee: (unassigned) => Krystian Kaniewski (kkaniewski)
> >
> > ** Changed in: linux-hwe-7.0 (Ubuntu Noble)
> >Status: New => Fix Committed
> >
> > ** Changed in: linux-hwe-7.0 (Ubuntu Noble)
> >Importance: Undecided => Critical
> >
> > ** Changed in: linux-hwe-7.0 (Ubuntu Noble)
> >  Assignee: (unassigned) => Krystian Kaniewski (kkaniewski)
> >
> > ** Changed in: linux (Ubuntu Noble)
> >Status: New => Invalid
> >
> > ** Changed in: linux-hwe-7.0 (Ubuntu Resolute)
> >Status: New => Invalid
> >
> > ** Changed in: linux (Ubuntu Noble)
> >  Assignee: (unassigned) => Krystian Kaniewski (kkaniewski)
> >
> > ** Changed in: linux-hwe-7.0 (Ubuntu Resolute)
> >  Assignee: (unassigned) => Krystian Kaniewski (kkaniewski)
> >
> > ** Changed in: linux (Ubuntu Resolute)
> >Importance: Undecided => Critical
> >
> > ** Changed in: linux (Ubuntu Resolute)
> >Importance: Critical => High
> >
> > ** Changed in: linux-hwe-7.0 (Ubuntu Noble)
> >Importance: Critical => High
> >
> > --
> > You received this bug notification because you are subscribed to a
> > duplicate bug report (2163479).
> > https://bugs.launchpad.net/bugs/2161309
> >
> > Title:
> >   Backlight regression
> >
> > Status in linux package in Ubuntu:
> >   Fix Committed
> > Status in linux-hwe-7.0 package in Ubuntu:
> >   Fix Committed
> > Status in linux source package in Noble:
> >   Invalid
> > Status in linux-hwe-7.0 source package in Noble:
> >   Fix Committed
> > Status in linux source package in Resolute:
> >   Fix Committed
> > Status in linux-hwe-7.0 source package in Resolute:
> >   Invalid
> >
> > Bug description:
> >   -
> >
> >   Possible workaround until 7.0.0-31 kernel is released
> >   Boot with i915.enable_dpcd_backlight=0 parameter
> >
> >   -
> >
> >
> >   ThinkPad T480
> >   Intel UHD 620
> >   brightness works on 7.0.0-27
> >   brightness fails on 7.0.0-28
> >   /sys/class/backlight/intel_backlight changes but panel does not
> >
> >   ProblemType: Bug
> >   DistroRelease: Ubuntu 26.04
> >   Package: linux-image-7.0.0-27-generic 7.0.0-27.27
> >   ProcVersionSignature: Ubuntu 7.0.0-27.27-generic 7.0.6
> >   Uname: Linux 7.0.0-27-generic x86_64
> >   ApportVersion: 2.34.0-0ubuntu2
> >   Architecture: amd64
> >   AudioDevicesInUse:
> >USERPID ACCESS COMMAND
> >/dev/snd/controlC0:  neal   3608 F wireplumber
> >/dev/snd/seq:neal   3589 F pipewire
> >   CasperMD5CheckResult: unknown
> >   CurrentDesktop: ubuntu:GNOME
> >   Date: Mon Jul 20 12:47:12 2026
> >   InstallationDate: Installed on 2026-07-12 (8 days ago)
> >   InstallationMedia: Ubuntu 26.04 "Resolute Raccoon" - Release amd64
> > (20260423.1)
> >   MachineType: LENOVO 20L6S6L601
> >   ProcFB: 0 i915drmfb
> >   ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-7.0.0-27-generic
> > root=UUID=1cea3fcd-0665-4cb4-a85a-4ebc58d5aed0 ro quiet splash
> > acpi_backlight=native
> >
> crashkernel=2G-4G:320M,4G-32G:512M,32G-64G:1024M,64G-128G:2048M,128G-:4096M
> >   SourcePackage: linux
> >   UpgradeStatus: No upgrade log present (probably fresh install)
> >   dmi.bios.date: 09/06/2025
> >   dmi.bios.release: 1.56
> >   dmi.bios.vendor: LENOVO
> >   dmi.bios.version: N24ET81W (1.56 )
> >   dmi.board.asset.tag: Not Available
> >   dmi.board.name: 20L6S6L601
> >   dmi.board.vendor: LENOVO
> >   dmi.board.version: SDK0J40697 WIN
> >   dmi.chassis.asset.tag: No Asset Information
> >   dmi.chassis.type: 10
> >   dmi.chassis.vendor: LENOVO
> >   dmi.chassis.version: None
> >   dmi.ec.firmware.release: 1.22
> >   dmi.modalias:
> >
> dmi:bvnLENOVO:bvrN24ET81W(1.56):bd09/06/2025:br1.56:efr1.22:svnLENOVO:pn20L6S6L601:pvrThinkPadT480:rvnLENOVO:rn20L6S6L601:rvrSDK0J40697WIN:cvnLENOVO:ct10:cvrNone:skuLENOVO_MT_20L6_BU_Think_FM_ThinkPadT480:pfaThinkPadT480:
> >   dmi.product.family: ThinkPad T480
> >   dmi.product.name: 20L6S6L601
> >   dmi.product.sku: LENOVO_MT_20L6_BU_Think_FM_ThinkPad T480
> >

[Bug 2161309] Re: Backlight regression

2026-08-21 Thread Pavol

Hi guys,

I have tested the proposed kernel on my system and can confirm that the
regression is fixed.

Hardware & System Details:
- Device: Dell Precision M4800
- OS: Ubuntu 26.04 LTS
- Graphics: Hybrid / Dual GPU (Intel HD Graphics + NVIDIA Quadro K1100M on 
nouveau)
- Tested Kernel Version: linux-image-7.0.0-31-generic (7.0.0-31.31) from 
-proposed

Test Results:
1. Backlight / Brightness Regulation: Works properly via Fn keyboard shortcuts 
as well as the GUI slider.
2. Suspend & Resume: The black screen issue is completely resolved. Upon waking 
from suspend, the screen backlight turns back on immediately.

Thank you for fixing this issue!
*

PS, Just as an aside note:
AI was very helpful - guide how to install linux-image-7.0.0-31-generic 
https://aistudio.google.com/
2 minutes for me

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Title:
  Backlight regression

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Re: [Bug 2161309] Re: Backlight regression

2026-08-19 Thread Prince Benedict Wachira

Ohh I wanted to inform the necessary parties that I was able to fix my
earlier started issue. Thanks for the feedback

On Wed, 19 Aug 2026 at 19:01, Krystian Kaniewski <[email protected]>
wrote:

> ** Also affects: linux (Ubuntu Resolute)
>Importance: Undecided
>Status: New
>
> ** Also affects: linux-hwe-7.0 (Ubuntu Resolute)
>Importance: Undecided
>Status: New
>
> ** Also affects: linux (Ubuntu Noble)
>Importance: Undecided
>Status: New
>
> ** Also affects: linux-hwe-7.0 (Ubuntu Noble)
>Importance: Undecided
>Status: New
>
> ** Changed in: linux (Ubuntu Resolute)
>Status: New => Fix Committed
>
> ** Changed in: linux (Ubuntu Resolute)
>  Assignee: (unassigned) => Krystian Kaniewski (kkaniewski)
>
> ** Changed in: linux-hwe-7.0 (Ubuntu Noble)
>Status: New => Fix Committed
>
> ** Changed in: linux-hwe-7.0 (Ubuntu Noble)
>Importance: Undecided => Critical
>
> ** Changed in: linux-hwe-7.0 (Ubuntu Noble)
>  Assignee: (unassigned) => Krystian Kaniewski (kkaniewski)
>
> ** Changed in: linux (Ubuntu Noble)
>Status: New => Invalid
>
> ** Changed in: linux-hwe-7.0 (Ubuntu Resolute)
>Status: New => Invalid
>
> ** Changed in: linux (Ubuntu Noble)
>  Assignee: (unassigned) => Krystian Kaniewski (kkaniewski)
>
> ** Changed in: linux-hwe-7.0 (Ubuntu Resolute)
>  Assignee: (unassigned) => Krystian Kaniewski (kkaniewski)
>
> ** Changed in: linux (Ubuntu Resolute)
>Importance: Undecided => Critical
>
> ** Changed in: linux (Ubuntu Resolute)
>Importance: Critical => High
>
> ** Changed in: linux-hwe-7.0 (Ubuntu Noble)
>Importance: Critical => High
>
> --
> You received this bug notification because you are subscribed to a
> duplicate bug report (2163479).
> https://bugs.launchpad.net/bugs/2161309
>
> Title:
>   Backlight regression
>
> Status in linux package in Ubuntu:
>   Fix Committed
> Status in linux-hwe-7.0 package in Ubuntu:
>   Fix Committed
> Status in linux source package in Noble:
>   Invalid
> Status in linux-hwe-7.0 source package in Noble:
>   Fix Committed
> Status in linux source package in Resolute:
>   Fix Committed
> Status in linux-hwe-7.0 source package in Resolute:
>   Invalid
>
> Bug description:
>   -
>
>   Possible workaround until 7.0.0-31 kernel is released
>   Boot with i915.enable_dpcd_backlight=0 parameter
>
>   -
>
>
>   ThinkPad T480
>   Intel UHD 620
>   brightness works on 7.0.0-27
>   brightness fails on 7.0.0-28
>   /sys/class/backlight/intel_backlight changes but panel does not
>
>   ProblemType: Bug
>   DistroRelease: Ubuntu 26.04
>   Package: linux-image-7.0.0-27-generic 7.0.0-27.27
>   ProcVersionSignature: Ubuntu 7.0.0-27.27-generic 7.0.6
>   Uname: Linux 7.0.0-27-generic x86_64
>   ApportVersion: 2.34.0-0ubuntu2
>   Architecture: amd64
>   AudioDevicesInUse:
>USERPID ACCESS COMMAND
>/dev/snd/controlC0:  neal   3608 F wireplumber
>/dev/snd/seq:neal   3589 F pipewire
>   CasperMD5CheckResult: unknown
>   CurrentDesktop: ubuntu:GNOME
>   Date: Mon Jul 20 12:47:12 2026
>   InstallationDate: Installed on 2026-07-12 (8 days ago)
>   InstallationMedia: Ubuntu 26.04 "Resolute Raccoon" - Release amd64
> (20260423.1)
>   MachineType: LENOVO 20L6S6L601
>   ProcFB: 0 i915drmfb
>   ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-7.0.0-27-generic
> root=UUID=1cea3fcd-0665-4cb4-a85a-4ebc58d5aed0 ro quiet splash
> acpi_backlight=native
> crashkernel=2G-4G:320M,4G-32G:512M,32G-64G:1024M,64G-128G:2048M,128G-:4096M
>   SourcePackage: linux
>   UpgradeStatus: No upgrade log present (probably fresh install)
>   dmi.bios.date: 09/06/2025
>   dmi.bios.release: 1.56
>   dmi.bios.vendor: LENOVO
>   dmi.bios.version: N24ET81W (1.56 )
>   dmi.board.asset.tag: Not Available
>   dmi.board.name: 20L6S6L601
>   dmi.board.vendor: LENOVO
>   dmi.board.version: SDK0J40697 WIN
>   dmi.chassis.asset.tag: No Asset Information
>   dmi.chassis.type: 10
>   dmi.chassis.vendor: LENOVO
>   dmi.chassis.version: None
>   dmi.ec.firmware.release: 1.22
>   dmi.modalias:
> dmi:bvnLENOVO:bvrN24ET81W(1.56):bd09/06/2025:br1.56:efr1.22:svnLENOVO:pn20L6S6L601:pvrThinkPadT480:rvnLENOVO:rn20L6S6L601:rvrSDK0J40697WIN:cvnLENOVO:ct10:cvrNone:skuLENOVO_MT_20L6_BU_Think_FM_ThinkPadT480:pfaThinkPadT480:
>   dmi.product.family: ThinkPad T480
>   dmi.product.name: 20L6S6L601
>   dmi.product.sku: LENOVO_MT_20L6_BU_Think_FM_ThinkPad T480
>   dmi.product.version: ThinkPad T480
>   dmi.sys.vendor: LENOVO
>
> To manage notifications about this bug go to:
> https://bugs.launchpad.net/ubuntu/+source/linux/+bug/2161309/+subscriptions
>
>

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Title:
  Backlight regression

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[Bug 2161309] Re: Backlight regression

2026-08-19 Thread Krystian Kaniewski

** Also affects: linux (Ubuntu Resolute)
   Importance: Undecided
   Status: New

** Also affects: linux-hwe-7.0 (Ubuntu Resolute)
   Importance: Undecided
   Status: New

** Also affects: linux (Ubuntu Noble)
   Importance: Undecided
   Status: New

** Also affects: linux-hwe-7.0 (Ubuntu Noble)
   Importance: Undecided
   Status: New

** Changed in: linux (Ubuntu Resolute)
   Status: New => Fix Committed

** Changed in: linux (Ubuntu Resolute)
 Assignee: (unassigned) => Krystian Kaniewski (kkaniewski)

** Changed in: linux-hwe-7.0 (Ubuntu Noble)
   Status: New => Fix Committed

** Changed in: linux-hwe-7.0 (Ubuntu Noble)
   Importance: Undecided => Critical

** Changed in: linux-hwe-7.0 (Ubuntu Noble)
 Assignee: (unassigned) => Krystian Kaniewski (kkaniewski)

** Changed in: linux (Ubuntu Noble)
   Status: New => Invalid

** Changed in: linux-hwe-7.0 (Ubuntu Resolute)
   Status: New => Invalid

** Changed in: linux (Ubuntu Noble)
 Assignee: (unassigned) => Krystian Kaniewski (kkaniewski)

** Changed in: linux-hwe-7.0 (Ubuntu Resolute)
 Assignee: (unassigned) => Krystian Kaniewski (kkaniewski)

** Changed in: linux (Ubuntu Resolute)
   Importance: Undecided => Critical

** Changed in: linux (Ubuntu Resolute)
   Importance: Critical => High

** Changed in: linux-hwe-7.0 (Ubuntu Noble)
   Importance: Critical => High

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  Backlight regression

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[Bug 2161309] Re: Backlight regression

2026-08-19 Thread Leon Blum

7.0.0-31 fixed it for me :)

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Title:
  Backlight regression

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Re: [Bug 2161309] Re: Backlight regression

2026-08-18 Thread Craig Denson

currently on 7.0.0-2018-nvidia-bos. It's still broken there, also

On 8/18/26 01:24, Krystian Kaniewski wrote:
> @Craig Denson (lowclouds)
>
> Can you check "uname -r" for me? It will print out currently used kernel
> version.
>

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Re: [Bug 2161309] Re: Backlight regression

2026-08-18 Thread Istvan Nagy

Dear All,

Tested 7.0.0-1018-nvidia on a ThinkPad X250.

Kernel Linux Thinkpad-X250 7.0.0-1018-nvidia #18-Ubuntu SMP 
PREEMPT_DYNAMIC Wed Aug 12 05:40:06 UTC 2026 x86_64 GNU/Linux

The lid close/open graphics resume issue is fixed. I tested three lid 
close/open cycles and the graphical session resumed correctly every time.

Bests,

Istvan


2026. 08. 17. 17:34 keltezéssel, Ubuntu Kernel Bot írta:
> This bug is awaiting verification that the linux-nvidia/7.0.0-1018.18
> kernel in -proposed solves the problem. Please test the kernel and
> update this bug with the results. If the problem is solved, change the
> tag 'verification-needed-resolute-linux-nvidia' to 'verification-done-
> resolute-linux-nvidia'. If the problem still exists, change the tag
> 'verification-needed-resolute-linux-nvidia' to 'verification-failed-
> resolute-linux-nvidia'.
>
>
> If verification is not done by 5 working days from today, this fix will
> be dropped from the source code, and this bug will be closed.
>
>
> Seehttps://wiki.ubuntu.com/Testing/EnableProposed for documentation how
> to enable and use -proposed. Thank you!
>
>
> ** Tags added: kernel-spammed-resolute-linux-nvidia-v2 
> verification-needed-resolute-linux-nvidia
>

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Re: [Bug 2161309] Re: Backlight regression

2026-08-18 Thread Istvan Nagy

Hello,
Currently I am using this kernel version: 7.0.0-27-generic, as this work 
well regarding the bug what was reported.
The problem appeared in kernel version 7.0.0-29-generic and 7.0.0-29-generic

Hope it helps.

Br,

I.


2026. 08. 18. 10:24 keltezéssel, Krystian Kaniewski írta:
> @Craig Denson (lowclouds)
>
> Can you check "uname -r" for me? It will print out currently used kernel
> version.
>

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[Bug 2161309] Re: Backlight regression

2026-08-18 Thread Krystian Kaniewski

@Craig Denson (lowclouds)

Can you check "uname -r" for me? It will print out currently used kernel
version.

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[Bug 2161309] Re: Backlight regression

2026-08-17 Thread Ondrej

Kernel linux-image-7.0.0-31-generic solved the problem on my T470s.
Thank you all!

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[Bug 2161309] Re: Backlight regression

2026-08-17 Thread Ubuntu Kernel Bot

This bug is awaiting verification that the linux-nvidia-
bos/7.0.0-2018.18 kernel in -proposed solves the problem. Please test
the kernel and update this bug with the results. If the problem is
solved, change the tag 'verification-needed-resolute-linux-nvidia-bos'
to 'verification-done-resolute-linux-nvidia-bos'. If the problem still
exists, change the tag 'verification-needed-resolute-linux-nvidia-bos'
to 'verification-failed-resolute-linux-nvidia-bos'.


If verification is not done by 5 working days from today, this fix will
be dropped from the source code, and this bug will be closed.


See https://wiki.ubuntu.com/Testing/EnableProposed for documentation how
to enable and use -proposed. Thank you!


** Tags added: kernel-spammed-resolute-linux-nvidia-bos-v2 
verification-needed-resolute-linux-nvidia-bos

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[Bug 2161309] Re: Backlight regression

2026-08-17 Thread Craig Denson

Installed the following on LG Gram:
linux-image-7.0.0-1018-nvidia/resolute-proposed,now 7.0.0-1018.18 amd64 
[installed]
linux-modules-7.0.0-1018-nvidia/resolute-proposed,now 7.0.0-1018.18 amd64 
[installed,automatic]
linux-modules-nvidia-580-7.0.0-1018-nvidia/resolute-proposed,now 7.0.0-1018.18 
amd64 [installed]
linux-nvidia-tools-7.0.0-1018/resolute-proposed,now 7.0.0-1018.18 amd64 
[installed]
linux-objects-nvidia-580-7.0.0-1018-nvidia/resolute-proposed,now 7.0.0-1018.18 
amd64 [installed,automatic]
linux-signatures-nvidia-7.0.0-1018-nvidia/resolute-proposed,now 7.0.0-1018.18 
amd64 [installed,automatic]
linux-tools-7.0.0-1018-nvidia/resolute-proposed,now 7.0.0-1018.18 amd64 
[installed]

brightness still stuck on max

changed tag to verification failed. let me know if i failed the
verification.

** Tags removed: verification-needed-resolute-linux-nvidia
** Tags added: resolute-linux-nvidia verification-failed-

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[Bug 2161309] Re: Backlight regression

2026-08-17 Thread Ubuntu Kernel Bot

This bug is awaiting verification that the linux-nvidia/7.0.0-1018.18
kernel in -proposed solves the problem. Please test the kernel and
update this bug with the results. If the problem is solved, change the
tag 'verification-needed-resolute-linux-nvidia' to 'verification-done-
resolute-linux-nvidia'. If the problem still exists, change the tag
'verification-needed-resolute-linux-nvidia' to 'verification-failed-
resolute-linux-nvidia'.


If verification is not done by 5 working days from today, this fix will
be dropped from the source code, and this bug will be closed.


See https://wiki.ubuntu.com/Testing/EnableProposed for documentation how
to enable and use -proposed. Thank you!


** Tags added: kernel-spammed-resolute-linux-nvidia-v2 
verification-needed-resolute-linux-nvidia

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[Bug 2161309] Re: Backlight regression

2026-08-16 Thread Daniel van Vugt

** Tags added: noble

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[Bug 2161309] Re: Backlight regression

2026-08-16 Thread Daniel van Vugt

** Tags added: regression-update

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[Bug 2161309] Re: Backlight regression

2026-08-16 Thread Daniel Letzeisen

** Description changed:

+ -
+ 
+ Possible workaround until 7.0.0-31 kernel is released 
+ Boot with i915.enable_dpcd_backlight=0 parameter
+ 
+ -
+ 
+ 
  ThinkPad T480
  Intel UHD 620
  brightness works on 7.0.0-27
  brightness fails on 7.0.0-28
  /sys/class/backlight/intel_backlight changes but panel does not
  
  ProblemType: Bug
  DistroRelease: Ubuntu 26.04
  Package: linux-image-7.0.0-27-generic 7.0.0-27.27
  ProcVersionSignature: Ubuntu 7.0.0-27.27-generic 7.0.6
  Uname: Linux 7.0.0-27-generic x86_64
  ApportVersion: 2.34.0-0ubuntu2
  Architecture: amd64
  AudioDevicesInUse:
-  USERPID ACCESS COMMAND
-  /dev/snd/controlC0:  neal   3608 F wireplumber
-  /dev/snd/seq:neal   3589 F pipewire
+  USERPID ACCESS COMMAND
+  /dev/snd/controlC0:  neal   3608 F wireplumber
+  /dev/snd/seq:neal   3589 F pipewire
  CasperMD5CheckResult: unknown
  CurrentDesktop: ubuntu:GNOME
  Date: Mon Jul 20 12:47:12 2026
  InstallationDate: Installed on 2026-07-12 (8 days ago)
  InstallationMedia: Ubuntu 26.04 "Resolute Raccoon" - Release amd64 
(20260423.1)
  MachineType: LENOVO 20L6S6L601
  ProcFB: 0 i915drmfb
  ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-7.0.0-27-generic 
root=UUID=1cea3fcd-0665-4cb4-a85a-4ebc58d5aed0 ro quiet splash 
acpi_backlight=native 
crashkernel=2G-4G:320M,4G-32G:512M,32G-64G:1024M,64G-128G:2048M,128G-:4096M
  SourcePackage: linux
  UpgradeStatus: No upgrade log present (probably fresh install)
  dmi.bios.date: 09/06/2025
  dmi.bios.release: 1.56
  dmi.bios.vendor: LENOVO
  dmi.bios.version: N24ET81W (1.56 )
  dmi.board.asset.tag: Not Available
  dmi.board.name: 20L6S6L601
  dmi.board.vendor: LENOVO
  dmi.board.version: SDK0J40697 WIN
  dmi.chassis.asset.tag: No Asset Information
  dmi.chassis.type: 10
  dmi.chassis.vendor: LENOVO
  dmi.chassis.version: None
  dmi.ec.firmware.release: 1.22
  dmi.modalias: 
dmi:bvnLENOVO:bvrN24ET81W(1.56):bd09/06/2025:br1.56:efr1.22:svnLENOVO:pn20L6S6L601:pvrThinkPadT480:rvnLENOVO:rn20L6S6L601:rvrSDK0J40697WIN:cvnLENOVO:ct10:cvrNone:skuLENOVO_MT_20L6_BU_Think_FM_ThinkPadT480:pfaThinkPadT480:
  dmi.product.family: ThinkPad T480
  dmi.product.name: 20L6S6L601
  dmi.product.sku: LENOVO_MT_20L6_BU_Think_FM_ThinkPad T480
  dmi.product.version: ThinkPad T480
  dmi.sys.vendor: LENOVO

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[Bug 2161309] Re: Backlight regression

2026-08-11 Thread Krystian Kaniewski

Happy to help. Thanks for your help with investigation :)

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[Bug 2161309] Re: Backlight regression

2026-08-10 Thread npp

** Tags removed: verification-needed-resolute-linux
** Tags added: linux verification-done-resolute-

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[Bug 2161309] Re: Backlight regression

2026-08-10 Thread npp

Hi, I've checked that kernel and confirm the fix has worked and the
backlight is working as expected. Thank you!!

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[Bug 2161309] Re: Backlight regression

2026-08-10 Thread Ubuntu Kernel Bot

This bug is awaiting verification that the linux/7.0.0-31.31 kernel in
-proposed solves the problem. Please test the kernel and update this bug
with the results. If the problem is solved, change the tag
'verification-needed-resolute-linux' to 'verification-done-resolute-
linux'. If the problem still exists, change the tag 'verification-
needed-resolute-linux' to 'verification-failed-resolute-linux'.


If verification is not done by 5 working days from today, this fix will
be dropped from the source code, and this bug will be closed.


See https://wiki.ubuntu.com/Testing/EnableProposed for documentation how
to enable and use -proposed. Thank you!


** Tags added: kernel-spammed-resolute-linux-v2 
verification-needed-resolute-linux

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[Bug 2161309] Re: Backlight regression

2026-08-10 Thread Krystian Kaniewski

Hello,

I've been on my 2 week holidays and I'm back now :) Good news is, patch
has been applied while I was away and should probably land in 7.0.0-31
kernel sometime end of the month. Please let me know whether .31 has
fixed your backlight controls problem once it is available. Thanks for
the help!

** Changed in: linux (Ubuntu)
   Status: In Progress => Fix Committed

** Changed in: linux-hwe-7.0 (Ubuntu)
   Status: In Progress => Fix Committed

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[Bug 2161309] Re: Backlight regression

2026-08-05 Thread John Smith

So I just checked by completely removing nvidia drivers,
i.e.
sudo apt purge nvidia-*

then booting into latest available kernel, which at the time of this comment 
was,
Linux 7.0.0-29-generic (on (K)Ubuntu 26.04),

the problem persists in:
7.0.0-28-generic, and
7.0.0-29-generic

After reinstalling the proprietary drivers 580, and booting into 
7.0.0-27-generic,
the drivers are inactive but the brightness problem doesn't exist.

Problems being:
1.) No brightness control when the display is working
2.) After resume from suspend, the backlight of the inbuilt display does-not 
switch-on.

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[Bug 2161309] Re: Backlight regression

2026-08-04 Thread John Smith

I don't know if it's the same bug, but, the backlight doesn't turn on after 
resume from suspend,
and,
brightness controls do-not work when the display is on (i.e. before 
suspend-resume cycle).

Last good version: 7.0.0-27-generic
Problem kernels: 7.0.0-28-generic, 7.0.0-29-generic (as TESTED on both)

I have a dell Inspiron 7000 Gaming series laptop.
Intel 7700HQ processor 
and nVidia 1050 Ti Graphics Card (using proprietary nvidia driver 580).

Logged in to:
KDE plasma 6.6.5
wayland


How I tested 7.0.0-27-generic is working:
I selected that version in GRUB from advanced selection.

(Need to check that the brightness controls and suspend-resume is fixed 
because using old kernel OR nvvidia driver not loaded.)

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[Bug 2161309] Re: Backlight regression

2026-07-27 Thread Alice C. Munduruca

I've ACKed this on the mailing list, hopefully it will land in the next
Security cycle. (available in ~3-4 weeks once testing is complete)

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[Bug 2161309] Re: Backlight regression

2026-07-24 Thread Krystian Kaniewski

** Also affects: linux-hwe-7.0 (Ubuntu)
   Importance: Undecided
   Status: New

** Changed in: linux-hwe-7.0 (Ubuntu)
   Status: New => In Progress

** Changed in: linux-hwe-7.0 (Ubuntu)
   Importance: Undecided => High

** Changed in: linux-hwe-7.0 (Ubuntu)
 Assignee: (unassigned) => Krystian Kaniewski (kkaniewski)

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[Bug 2161309] Re: Backlight regression

2026-07-24 Thread Krystian Kaniewski

** Changed in: linux (Ubuntu)
   Status: Triaged => In Progress

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[Bug 2161309] Re: Backlight regression

2026-07-23 Thread Krystian Kaniewski

Thanks Neal for testing all these mainline kernels for me, it was really
helpful. It looks like we have got it narrowed down to the exact commit
I have been talking about.

I will try to get the fix to Ubuntu kernel now. Thanks once again!

** Changed in: linux (Ubuntu)
   Status: Confirmed => Triaged

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[Bug 2161309] Re: Backlight regression

2026-07-22 Thread npp

Hi, exactly as you predicted. Regression in r5 and works as expected in
r7.

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[Bug 2161309] Re: Backlight regression

2026-07-22 Thread Krystian Kaniewski

Thanks Neal!

It looks like 7.1.3 actually already had the fix included then. I'm now
trying to make sure whether f30fddb4402313aa5301a74d721638d343395269 is
a real fix here and also trace back first revision mainline kernel
version it was applied to, but it can be a little bit difficult
sometimes.

Would you mind testing two more mainline kernels?

7.1-r5: https://kernel.ubuntu.com/mainline/v7.1-rc5/ - expected to fail
7.1-r7: https://kernel.ubuntu.com/mainline/v7.1-rc7/ - expected to pass

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[Bug 2161309] Re: Backlight regression

2026-07-22 Thread npp

Hi, interestingly 7.1.3 doesn't have the regression in, both GNOME
brightness control and keyboard buttons work as expected.

uname -r is 7.1.3-070103-generic

Neal

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[Bug 2161309] Re: Backlight regression

2026-07-22 Thread Krystian Kaniewski

Great news! Can you also possibly test 7.1.3 mainline kernel if your
time allows? I'd expect you to hit the brightness regression once again
running on 7.1.3 mainline.

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[Bug 2161309] Re: Backlight regression

2026-07-22 Thread Krystian Kaniewski

You can find the link here:
https://kernel.ubuntu.com/mainline/v7.1.3/amd64/

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[Bug 2161309] Re: Backlight regression

2026-07-21 Thread npp

Just tried suspending and unsuspending - brightness works as expected
after unsuspend

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[Bug 2161309] Re: Backlight regression

2026-07-21 Thread npp

Hi, confirmed that brightness is working as expected using GNOME
brightness control in 7.1.4

neal@victory:/etc/default$ uname -r
7.1.4-070104-generic

Cheers, Neal

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[Bug 2161309] Re: Backlight regression

2026-07-21 Thread Krystian Kaniewski

Thank you for taking the time to report this issue and for providing the
diagnostic information. I appreciate your help.

A newer kernel includes a change that may restore brightness control on
this laptop. Please start with Mainline 7.1.4. If you are already
comfortable building Ubuntu kernels, there is also an advanced option
for Ubuntu kernel 7.0.0-28.

Start with Ubuntu Mainline kernel 7.1.4

1. I suggest testing Ubuntu Mainline kernel 7.1.4. It includes a change that
may restore working brightness controls on this laptop.
2. This test will show whether that change fixes the brightness problem seen
with the current Ubuntu kernel.
3. The official Ubuntu Mainline build for the reported amd64 architecture is
available here:

https://kernel.ubuntu.com/mainline/v7.1.4/amd64/

General Ubuntu instructions for installing, booting, checking, and
removing Mainline kernels are available here:

https://wiki.ubuntu.com/Kernel/MainlineBuilds

This is an unsupported test kernel, not a normal Ubuntu update. Its image is
unsigned and may not start with Secure Boot enabled. If it does not start,
please report that result rather than changing your Secure Boot settings solely
for this test.
4. After booting the test kernel, check the full brightness range with both
keyboard hotkeys and desktop controls. Repeat after suspend and resume, and
confirm that the screen itself becomes brighter or darker.
5. After booting, please run this command and include its output:

uname -r

6. Please report whether brightness control worked before and after
suspend, along with any installation or startup error.

Advanced option: build Ubuntu kernel 7.0.0-28 with fix
f30fddb4402313aa5301a74d721638d343395269

This is a lower-priority option for someone who is already comfortable building
Ubuntu kernels. It is not required for the Mainline comparison above.
The test would apply Revert drm/i915/backlight: Remove try_vesa_interface
(f30fddb4402313aa5301a74d721638d343395269) to the Ubuntu 7.0.0-28 kernel source.
This change may make the brightness keys and desktop brightness control affect
the screen again.

Source for the fix:

https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=f30fddb4402313aa5301a74d721638d343395269

Official Ubuntu instructions for obtaining the source, applying a patch,
building packages, installing the kernel, and checking the result:

https://ubuntu.com/kernel/docs/latest/how-to/develop-customise/build-
kernel/

If you choose this advanced test, please check the full brightness range
before and after suspend. After booting the test kernel, run this
command and include its output:

uname -r

Please report whether the screen itself becomes brighter or darker,
along with any installation or startup error.

** Changed in: linux (Ubuntu)
Importance: Undecided => High

** Changed in: linux (Ubuntu)
Status: New => Confirmed

** Changed in: linux (Ubuntu)
Assignee: (unassigned) => Krystian Kaniewski (kkaniewski)

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[Bug 2161309] Re: Backlight regression

2026-07-21 Thread jpaulh

Me too  works on 7.0.0.14 and fail on 7.0.0.28 with Linux mint and
latitude ltitude 7390.

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[Bug 2161309] Re: Backlight regression

2026-07-20 Thread Ubuntu Kernel Bot

** Tags added: kernel-daily-bug

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[Bug 2161309] Re: Backlight regression

2026-07-20 Thread npp

To clarify - the bug is in .28 rather than .27 that was running when I
ran the bug report.

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