Public bug reported:
Bug Description:
Display brightness adjustments (via FN keys and system slider) stopped working
completely after upgrading to kernel 7.0.0-28-generic.
Hardware & Environment:
- Laptop: MSI Katana GF66 11UE
- GPU: Nvidia GeForce RTX 3060 Mobile / Intel UHD Graphics
- OS: Ubuntu 24.04 LTS
- Affected Kernel: 7.0.0-28-generic
- Working Kernel: 6.17.0-40-generic
Details:
1. On kernel 6.17.0-40-generic, display brightness control works as expected.
2. After booting into 7.0.0-28-generic, the brightness slider has no effect.
3. Tried setting acpi_backlight=vendor (slider disappears completely) as well
as acpi_backlight=native and acpi_backlight=video (slider is present, but
brightness does not change).
4. Checking /sys/class/backlight/ shows only acpi_video0 and acpi_video1.
This appears to be a kernel/ACPI/Nvidia backlight driver regression in
the 7.0.x branch.
ProblemType: Bug
DistroRelease: Ubuntu 24.04
Package: linux-image-7.0.0-28-generic 7.0.0-28.28~24.04.1
ProcVersionSignature: Ubuntu 7.0.0-28.28~24.04.1-generic 7.0.12
Uname: Linux 7.0.0-28-generic x86_64
ApportVersion: 2.28.2-0ubuntu0.1
Architecture: amd64
AudioDevicesInUse:
USER PID ACCESS COMMAND
/dev/snd/controlC1: alex 3255 F.... pipewire
alex 3259 F.... wireplumber
/dev/snd/controlC0: alex 3259 F.... wireplumber
/dev/snd/seq: alex 3255 F.... pipewire
CasperMD5CheckResult: pass
CurrentDesktop: ubuntu:GNOME
Date: Sat Jul 25 07:33:43 2026
InstallationDate: Installed on 2025-03-22 (490 days ago)
InstallationMedia: Ubuntu 24.04.2 LTS "Noble Numbat" - Release amd64 (20250215)
MachineType: Micro-Star International Co., Ltd. Katana GF66 11UE
ProcEnviron:
LANG=en_US.UTF-8
PATH=(custom, no user)
SHELL=/bin/bash
TERM=xterm-256color
XDG_RUNTIME_DIR=<set>
ProcFB: 0 i915drmfb
ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-7.0.0-28-generic
root=UUID=c1252c32-da45-41fa-99d4-8691d27e3f2f ro quiet splash
acpi_backlight=video vt.handoff=7
RelatedPackageVersions:
linux-restricted-modules-7.0.0-28-generic N/A
linux-backports-modules-7.0.0-28-generic N/A
linux-firmware 20240318.git3b128b60-0ubuntu2.27
SourcePackage: linux-hwe-7.0
UpgradeStatus: No upgrade log present (probably fresh install)
dmi.bios.date: 09/23/2021
dmi.bios.release: 3.13
dmi.bios.vendor: American Megatrends International, LLC.
dmi.bios.version: E1581IMS.30D
dmi.board.asset.tag: Default string
dmi.board.name: MS-1581
dmi.board.vendor: Micro-Star International Co., Ltd.
dmi.board.version: REV:1.0
dmi.chassis.asset.tag: No Asset Tag
dmi.chassis.type: 10
dmi.chassis.vendor: Micro-Star International Co., Ltd.
dmi.chassis.version: N/A
dmi.modalias:
dmi:bvnAmericanMegatrendsInternational,LLC.:bvrE1581IMS.30D:bd09/23/2021:br3.13:svnMicro-StarInternationalCo.,Ltd.:pnKatanaGF6611UE:pvrREV1.0:rvnMicro-StarInternationalCo.,Ltd.:rnMS-1581:rvrREV1.0:cvnMicro-StarInternationalCo.,Ltd.:ct10:cvrN/A:sku1581.3:pfaGF:
dmi.product.family: GF
dmi.product.name: Katana GF66 11UE
dmi.product.sku: 1581.3
dmi.product.version: REV:1.0
dmi.sys.vendor: Micro-Star International Co., Ltd.
** Affects: linux-hwe-7.0 (Ubuntu)
Importance: Undecided
Status: New
** Tags: amd64 apport-bug noble
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https://bugs.launchpad.net/bugs/2161779
Title:
Display brightness control stopped working after upgrading to kernel
7.0.0-28 on MSI Katana GF66
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