[Kernel-packages] [Bug 2008882] Re: Remove all other acpi_video backlight interface on Dell AIO platforms
** Changed in: linux (Ubuntu Lunar)
Status: In Progress => Won't Fix
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https://bugs.launchpad.net/bugs/2008882
Title:
Make backlight module auto detect dell_uart_backlight
Status in HWE Next:
New
Status in linux package in Ubuntu:
In Progress
Status in linux-oem-6.1 package in Ubuntu:
Invalid
Status in linux-oem-6.5 package in Ubuntu:
Invalid
Status in linux source package in Jammy:
Invalid
Status in linux-oem-6.1 source package in Jammy:
Fix Released
Status in linux-oem-6.5 source package in Jammy:
In Progress
Status in linux source package in Lunar:
Won't Fix
Status in linux-oem-6.1 source package in Lunar:
Invalid
Status in linux-oem-6.5 source package in Lunar:
Invalid
Status in linux source package in Mantic:
In Progress
Status in linux-oem-6.1 source package in Mantic:
Invalid
Status in linux-oem-6.5 source package in Mantic:
Invalid
Bug description:
[Impact]
There are acpi_video* sysfs backlight interface in the system which are not
working.
For Dell AIO platforms, we use dell_uart_backlight to control the display
brightness.
The old way to fix this is to unregister acpi backlight interfaces in the
backlight driver, but it may lead to some issues and the unregister function
has been removed since v6.1-rc1
77ab9d4d44cd ("ACPI: video: Remove acpi_video_set_dmi_backlight_type()")
[Fix]
The new way to do this is to collect all the quirk and auto detection method
in video_detect.c
I added an audo detection for the Dell AIO platoform to the driver which
should do the same thing as the old way.
[Test]
Verified on the Dell AIO platform and confirmed there is only on
dell_uart_backlight in the sysfs, and no acpi_video* interface.
[Where problems could occur]
There should be no regression potential, it uses different way to do the same
thing, should be pretty safe.
To manage notifications about this bug go to:
https://bugs.launchpad.net/hwe-next/+bug/2008882/+subscriptions
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[Kernel-packages] [Bug 2008882] Re: Remove all other acpi_video backlight interface on Dell AIO platforms
** Also affects: linux-oem-6.5 (Ubuntu)
Importance: Undecided
Status: New
** Changed in: linux-oem-6.5 (Ubuntu Jammy)
Status: New => In Progress
** Changed in: linux-oem-6.5 (Ubuntu Lunar)
Status: New => Invalid
** Changed in: linux-oem-6.5 (Ubuntu Mantic)
Status: New => Invalid
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https://bugs.launchpad.net/bugs/2008882
Title:
Remove all other acpi_video backlight interface on Dell AIO platforms
Status in HWE Next:
New
Status in linux package in Ubuntu:
In Progress
Status in linux-oem-6.1 package in Ubuntu:
Invalid
Status in linux-oem-6.5 package in Ubuntu:
Invalid
Status in linux source package in Jammy:
Invalid
Status in linux-oem-6.1 source package in Jammy:
Fix Released
Status in linux-oem-6.5 source package in Jammy:
In Progress
Status in linux source package in Lunar:
In Progress
Status in linux-oem-6.1 source package in Lunar:
Invalid
Status in linux-oem-6.5 source package in Lunar:
Invalid
Status in linux source package in Mantic:
In Progress
Status in linux-oem-6.1 source package in Mantic:
Invalid
Status in linux-oem-6.5 source package in Mantic:
Invalid
Bug description:
[Impact]
There are acpi_video* sysfs backlight interface in the system which are not
working.
For Dell AIO platforms, we use dell_uart_backlight to control the display
brightness.
The old way to fix this is to unregister acpi backlight interfaces in the
backlight driver, but it may lead to some issues and the unregister function
has been removed since v6.1-rc1
77ab9d4d44cd ("ACPI: video: Remove acpi_video_set_dmi_backlight_type()")
[Fix]
The new way to do this is to collect all the quirk and auto detection method
in video_detect.c
I added an audo detection for the Dell AIO platoform to the driver which
should do the same thing as the old way.
[Test]
Verified on the Dell AIO platform and confirmed there is only on
dell_uart_backlight in the sysfs, and no acpi_video* interface.
[Where problems could occur]
There should be no regression potential, it uses different way to do the same
thing, should be pretty safe.
To manage notifications about this bug go to:
https://bugs.launchpad.net/hwe-next/+bug/2008882/+subscriptions
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[Kernel-packages] [Bug 2008882] Re: Remove all other acpi_video backlight interface on Dell AIO platforms
** Changed in: linux (Ubuntu Lunar)
Importance: Undecided => Medium
** Changed in: linux (Ubuntu Mantic)
Importance: Undecided => Medium
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https://bugs.launchpad.net/bugs/2008882
Title:
Remove all other acpi_video backlight interface on Dell AIO platforms
Status in HWE Next:
New
Status in linux package in Ubuntu:
In Progress
Status in linux-oem-6.1 package in Ubuntu:
Invalid
Status in linux source package in Jammy:
Invalid
Status in linux-oem-6.1 source package in Jammy:
Fix Released
Status in linux source package in Lunar:
In Progress
Status in linux-oem-6.1 source package in Lunar:
Invalid
Status in linux source package in Mantic:
In Progress
Status in linux-oem-6.1 source package in Mantic:
Invalid
Bug description:
[Impact]
There are acpi_video* sysfs backlight interface in the system which are not
working.
For Dell AIO platforms, we use dell_uart_backlight to control the display
brightness.
The old way to fix this is to unregister acpi backlight interfaces in the
backlight driver, but it may lead to some issues and the unregister function
has been removed since v6.1-rc1
77ab9d4d44cd ("ACPI: video: Remove acpi_video_set_dmi_backlight_type()")
[Fix]
The new way to do this is to collect all the quirk and auto detection method
in video_detect.c
I added an audo detection for the Dell AIO platoform to the driver which
should do the same thing as the old way.
[Test]
Verified on the Dell AIO platform and confirmed there is only on
dell_uart_backlight in the sysfs, and no acpi_video* interface.
[Where problems could occur]
There should be no regression potential, it uses different way to do the same
thing, should be pretty safe.
To manage notifications about this bug go to:
https://bugs.launchpad.net/hwe-next/+bug/2008882/+subscriptions
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[Kernel-packages] [Bug 2008882] Re: Remove all other acpi_video backlight interface on Dell AIO platforms
** Also affects: linux (Ubuntu Mantic)
Importance: Undecided
Assignee: AceLan Kao (acelankao)
Status: In Progress
** Also affects: linux-oem-6.1 (Ubuntu Mantic)
Importance: Undecided
Status: Invalid
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You received this bug notification because you are a member of Kernel
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https://bugs.launchpad.net/bugs/2008882
Title:
Remove all other acpi_video backlight interface on Dell AIO platforms
Status in HWE Next:
New
Status in linux package in Ubuntu:
In Progress
Status in linux-oem-6.1 package in Ubuntu:
Invalid
Status in linux source package in Jammy:
Invalid
Status in linux-oem-6.1 source package in Jammy:
Fix Released
Status in linux source package in Lunar:
In Progress
Status in linux-oem-6.1 source package in Lunar:
Invalid
Status in linux source package in Mantic:
In Progress
Status in linux-oem-6.1 source package in Mantic:
Invalid
Bug description:
[Impact]
There are acpi_video* sysfs backlight interface in the system which are not
working.
For Dell AIO platforms, we use dell_uart_backlight to control the display
brightness.
The old way to fix this is to unregister acpi backlight interfaces in the
backlight driver, but it may lead to some issues and the unregister function
has been removed since v6.1-rc1
77ab9d4d44cd ("ACPI: video: Remove acpi_video_set_dmi_backlight_type()")
[Fix]
The new way to do this is to collect all the quirk and auto detection method
in video_detect.c
I added an audo detection for the Dell AIO platoform to the driver which
should do the same thing as the old way.
[Test]
Verified on the Dell AIO platform and confirmed there is only on
dell_uart_backlight in the sysfs, and no acpi_video* interface.
[Where problems could occur]
There should be no regression potential, it uses different way to do the same
thing, should be pretty safe.
To manage notifications about this bug go to:
https://bugs.launchpad.net/hwe-next/+bug/2008882/+subscriptions
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[Kernel-packages] [Bug 2008882] Re: Remove all other acpi_video backlight interface on Dell AIO platforms
This bug was fixed in the package linux-oem-6.1 - 6.1.0-1008.8 --- linux-oem-6.1 (6.1.0-1008.8) jammy; urgency=medium * jammy/linux-oem-6.1: 6.1.0-1008.8 -proposed tracker (LP: #2008352) * overlayfs mounts as R/O over idmapped mount (LP: #2009065) - SAUCE: overlayfs: handle idmapped mounts in ovl_do_(set|remove)xattr * Some QHD panels fail to refresh when PSR2 enabled (LP: #2009014) - SAUCE: drm/i915/psr: Use calculated io and fast wake lines * Fix mediatek wifi driver crash when loading wrong SAR table (LP: #2009118) - wifi: mt76: mt7921: fix error code of return in mt7921_acpi_read * Packaging resync (LP: #1786013) - [Packaging] update update.conf * Update dg2_dmc to 2.08 (LP: #1999375) - drm/i915/dmc: Update DG2 DMC version to v2.08 * New DG2 workarounds (LP: #2006945) - drm/i915/dg2: Introduce Wa_18017747507 - drm/i915/dg2: Introduce Wa_18018764978 - drm/i915/dg2: Introduce Wa_18019271663 * Screen backlight keeps in minimized and can't change it with amdgpu (LP: #2008871) - SAUCE: ACPI: video: Add backlight=native DMI quirk for Dell Vostro 15 3535 * Remove all other acpi_video backlight interface on Dell AIO platforms (LP: #2008882) - SAUCE: ACPI: video: Dell AIO UART backlight detection * screen flicker after PSR2 enabled (LP: #2007516) - SAUCE: drm/i915/display/psr: Disable PSR2 sel fetch on panel SHP 5457 * rtcpie in timers from ubuntu_kernel_selftests randomly failing (LP: #1814234) - SAUCE: selftest: rtcpie: Force passing unreliable subtest * Fix HFP mSBC support on Realtek Bluetooth USB controller (LP: #2007331) - Bluetooth: btrtl: Add btrealtek data struct - Bluetooth: btusb: Ignore zero length of USB packets on ALT 6 for specific chip * Jammy update: v6.1.14 upstream stable release (LP: #2008708) - drm/etnaviv: don't truncate physical page address - wifi: ath11k: fix warning in dma_free_coherent() of memory chunks while recovery - wifi: rtl8xxxu: gen2: Turn on the rate control - drm/edid: Fix minimum bpc supported with DSC1.2 for HDMI sink - clk: mxl: Switch from direct readl/writel based IO to regmap based IO - clk: mxl: Remove redundant spinlocks - clk: mxl: Add option to override gate clks - clk: mxl: Fix a clk entry by adding relevant flags - powerpc: dts: t208x: Mark MAC1 and MAC2 as 10G - clk: mxl: syscon_node_to_regmap() returns error pointers - sched/psi: Stop relying on timer_pending() for poll_work rescheduling - random: always mix cycle counter in add_latent_entropy() - scsi: libsas: Add smp_ata_check_ready_type() - scsi: hisi_sas: Fix SATA devices missing issue during I_T nexus reset - spi: mediatek: Enable irq when pdata is ready - docs: perf: Fix PMU instance name of hisi-pcie-pmu - KVM: x86: Fail emulation during EMULTYPE_SKIP on any exception - KVM: SVM: Skip WRMSR fastpath on VM-Exit if next RIP isn't valid - KVM: VMX: Execute IBPB on emulated VM-exit when guest has IBRS - can: kvaser_usb: hydra: help gcc-13 to figure out cmd_len - powerpc: dts: t208x: Disable 10G on MAC1 and MAC2 - spi: mediatek: Enable irq before the spi registration - drm/i915: Remove __maybe_unused from mtl_info - KVM: x86: fix deadlock for KVM_XEN_EVTCHN_RESET - selftests: kvm: move declaration at the beginning of main() - powerpc/64s/radix: Fix RWX mapping with relocated kernel - nfp: ethtool: support reporting link modes - nfp: ethtool: fix the bug of setting unsupported port speed - uaccess: Add speculation barrier to copy_from_user() - x86/alternatives: Introduce int3_emulate_jcc() - x86/alternatives: Teach text_poke_bp() to patch Jcc.d32 instructions - x86/static_call: Add support for Jcc tail-calls - Bluetooth: btusb: Add more device IDs for WCN6855 - riscv: remove special treatment for the link order of head.o - arm64: remove special treatment for the link order of head.o - arch: fix broken BuildID for arm64 and riscv - powerpc/vmlinux.lds: Define RUNTIME_DISCARD_EXIT - powerpc/vmlinux.lds: Don't discard .rela* for relocatable builds - s390: define RUNTIME_DISCARD_EXIT to fix link error with GNU ld < 2.36 - sh: define RUNTIME_DISCARD_EXIT - wifi: mwifiex: Add missing compatible string for SD8787 - audit: update the mailing list in MAINTAINERS - platform/x86/amd/pmf: Add depends on CONFIG_POWER_SUPPLY - platform/x86: nvidia-wmi-ec-backlight: Add force module parameter - ext4: Fix function prototype mismatch for ext4_feat_ktype - randstruct: disable Clang 15 support - bpf: add missing header file include - Linux 6.1.14 - upstream stable to v6.1.14 * Jammy update: v6.1.13 upstream stable release (LP: #2008707) - mptcp: sockopt: make 'tcp_fastopen_connect' generic - mptcp: fix locking for setsockopt corner-case - mptcp: deduplicate error paths on endpoint creation
[Kernel-packages] [Bug 2008882] Re: Remove all other acpi_video backlight interface on Dell AIO platforms
Hopeful! My screen is much bright and I have to stop my job!
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You received this bug notification because you are a member of Kernel
Packages, which is subscribed to linux-oem-6.1 in Ubuntu.
https://bugs.launchpad.net/bugs/2008882
Title:
Remove all other acpi_video backlight interface on Dell AIO platforms
Status in HWE Next:
New
Status in linux package in Ubuntu:
In Progress
Status in linux-oem-6.1 package in Ubuntu:
Invalid
Status in linux source package in Jammy:
Invalid
Status in linux-oem-6.1 source package in Jammy:
In Progress
Status in linux source package in Lunar:
In Progress
Status in linux-oem-6.1 source package in Lunar:
Invalid
Bug description:
[Impact]
There are acpi_video* sysfs backlight interface in the system which are not
working.
For Dell AIO platforms, we use dell_uart_backlight to control the display
brightness.
The old way to fix this is to unregister acpi backlight interfaces in the
backlight driver, but it may lead to some issues and the unregister function
has been removed since v6.1-rc1
77ab9d4d44cd ("ACPI: video: Remove acpi_video_set_dmi_backlight_type()")
[Fix]
The new way to do this is to collect all the quirk and auto detection method
in video_detect.c
I added an audo detection for the Dell AIO platoform to the driver which
should do the same thing as the old way.
[Test]
Verified on the Dell AIO platform and confirmed there is only on
dell_uart_backlight in the sysfs, and no acpi_video* interface.
[Where problems could occur]
There should be no regression potential, it uses different way to do the same
thing, should be pretty safe.
To manage notifications about this bug go to:
https://bugs.launchpad.net/hwe-next/+bug/2008882/+subscriptions
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[Kernel-packages] [Bug 2008882] Re: Remove all other acpi_video backlight interface on Dell AIO platforms
Verified the backlight interface is correct with 6.1.0-1008-oem.
** Tags removed: verification-needed-jammy
** Tags added: verification-done-jammy
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https://bugs.launchpad.net/bugs/2008882
Title:
Remove all other acpi_video backlight interface on Dell AIO platforms
Status in HWE Next:
New
Status in linux package in Ubuntu:
In Progress
Status in linux-oem-6.1 package in Ubuntu:
Invalid
Status in linux source package in Jammy:
Invalid
Status in linux-oem-6.1 source package in Jammy:
In Progress
Status in linux source package in Lunar:
In Progress
Status in linux-oem-6.1 source package in Lunar:
Invalid
Bug description:
[Impact]
There are acpi_video* sysfs backlight interface in the system which are not
working.
For Dell AIO platforms, we use dell_uart_backlight to control the display
brightness.
The old way to fix this is to unregister acpi backlight interfaces in the
backlight driver, but it may lead to some issues and the unregister function
has been removed since v6.1-rc1
77ab9d4d44cd ("ACPI: video: Remove acpi_video_set_dmi_backlight_type()")
[Fix]
The new way to do this is to collect all the quirk and auto detection method
in video_detect.c
I added an audo detection for the Dell AIO platoform to the driver which
should do the same thing as the old way.
[Test]
Verified on the Dell AIO platform and confirmed there is only on
dell_uart_backlight in the sysfs, and no acpi_video* interface.
[Where problems could occur]
There should be no regression potential, it uses different way to do the same
thing, should be pretty safe.
To manage notifications about this bug go to:
https://bugs.launchpad.net/hwe-next/+bug/2008882/+subscriptions
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[Kernel-packages] [Bug 2008882] Re: Remove all other acpi_video backlight interface on Dell AIO platforms
Hi Larry,
You have to wait the new kernel for Lunar, should be available soon.
The OEM kernel is in -proposed(6.1.0-1008.8-oem) now which contains the fix if
you want to try.
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You received this bug notification because you are a member of Kernel
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https://bugs.launchpad.net/bugs/2008882
Title:
Remove all other acpi_video backlight interface on Dell AIO platforms
Status in HWE Next:
New
Status in linux package in Ubuntu:
In Progress
Status in linux-oem-6.1 package in Ubuntu:
Invalid
Status in linux source package in Jammy:
Invalid
Status in linux-oem-6.1 source package in Jammy:
In Progress
Status in linux source package in Lunar:
In Progress
Status in linux-oem-6.1 source package in Lunar:
Invalid
Bug description:
[Impact]
There are acpi_video* sysfs backlight interface in the system which are not
working.
For Dell AIO platforms, we use dell_uart_backlight to control the display
brightness.
The old way to fix this is to unregister acpi backlight interfaces in the
backlight driver, but it may lead to some issues and the unregister function
has been removed since v6.1-rc1
77ab9d4d44cd ("ACPI: video: Remove acpi_video_set_dmi_backlight_type()")
[Fix]
The new way to do this is to collect all the quirk and auto detection method
in video_detect.c
I added an audo detection for the Dell AIO platoform to the driver which
should do the same thing as the old way.
[Test]
Verified on the Dell AIO platform and confirmed there is only on
dell_uart_backlight in the sysfs, and no acpi_video* interface.
[Where problems could occur]
There should be no regression potential, it uses different way to do the same
thing, should be pretty safe.
To manage notifications about this bug go to:
https://bugs.launchpad.net/hwe-next/+bug/2008882/+subscriptions
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[Kernel-packages] [Bug 2008882] Re: Remove all other acpi_video backlight interface on Dell AIO platforms
After upgrading Ubuntu to `Lunar Lobster`, I couldn't adjust the
brightness of my laptop under `Software Rendering` now.
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You received this bug notification because you are a member of Kernel
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https://bugs.launchpad.net/bugs/2008882
Title:
Remove all other acpi_video backlight interface on Dell AIO platforms
Status in HWE Next:
New
Status in linux package in Ubuntu:
In Progress
Status in linux-oem-6.1 package in Ubuntu:
Invalid
Status in linux source package in Jammy:
Invalid
Status in linux-oem-6.1 source package in Jammy:
In Progress
Status in linux source package in Lunar:
In Progress
Status in linux-oem-6.1 source package in Lunar:
Invalid
Bug description:
[Impact]
There are acpi_video* sysfs backlight interface in the system which are not
working.
For Dell AIO platforms, we use dell_uart_backlight to control the display
brightness.
The old way to fix this is to unregister acpi backlight interfaces in the
backlight driver, but it may lead to some issues and the unregister function
has been removed since v6.1-rc1
77ab9d4d44cd ("ACPI: video: Remove acpi_video_set_dmi_backlight_type()")
[Fix]
The new way to do this is to collect all the quirk and auto detection method
in video_detect.c
I added an audo detection for the Dell AIO platoform to the driver which
should do the same thing as the old way.
[Test]
Verified on the Dell AIO platform and confirmed there is only on
dell_uart_backlight in the sysfs, and no acpi_video* interface.
[Where problems could occur]
There should be no regression potential, it uses different way to do the same
thing, should be pretty safe.
To manage notifications about this bug go to:
https://bugs.launchpad.net/hwe-next/+bug/2008882/+subscriptions
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[Kernel-packages] [Bug 2008882] Re: Remove all other acpi_video backlight interface on Dell AIO platforms
This bug is awaiting verification that the linux-oem-6.1/6.1.0-1008.8
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-jammy' to 'verification-done-jammy'. If the
problem still exists, change the tag 'verification-needed-jammy' to
'verification-failed-jammy'.
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-jammy-linux-oem-6.1 verification-needed-jammy
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https://bugs.launchpad.net/bugs/2008882
Title:
Remove all other acpi_video backlight interface on Dell AIO platforms
Status in HWE Next:
New
Status in linux package in Ubuntu:
In Progress
Status in linux-oem-6.1 package in Ubuntu:
Invalid
Status in linux source package in Jammy:
Invalid
Status in linux-oem-6.1 source package in Jammy:
In Progress
Status in linux source package in Lunar:
In Progress
Status in linux-oem-6.1 source package in Lunar:
Invalid
Bug description:
[Impact]
There are acpi_video* sysfs backlight interface in the system which are not
working.
For Dell AIO platforms, we use dell_uart_backlight to control the display
brightness.
The old way to fix this is to unregister acpi backlight interfaces in the
backlight driver, but it may lead to some issues and the unregister function
has been removed since v6.1-rc1
77ab9d4d44cd ("ACPI: video: Remove acpi_video_set_dmi_backlight_type()")
[Fix]
The new way to do this is to collect all the quirk and auto detection method
in video_detect.c
I added an audo detection for the Dell AIO platoform to the driver which
should do the same thing as the old way.
[Test]
Verified on the Dell AIO platform and confirmed there is only on
dell_uart_backlight in the sysfs, and no acpi_video* interface.
[Where problems could occur]
There should be no regression potential, it uses different way to do the same
thing, should be pretty safe.
To manage notifications about this bug go to:
https://bugs.launchpad.net/hwe-next/+bug/2008882/+subscriptions
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[Kernel-packages] [Bug 2008882] Re: Remove all other acpi_video backlight interface on Dell AIO platforms
** Description changed:
[Impact]
+ There are acpi_video* sysfs backlight interface in the system which are not
working.
+ For Dell AIO platforms, we use dell_uart_backlight to control the display
brightness.
+ The old way to fix this is to unregister acpi backlight interfaces in the
backlight driver, but it may lead to some issues and the unregister function
has been removed since v6.1-rc1
+ 77ab9d4d44cd ("ACPI: video: Remove acpi_video_set_dmi_backlight_type()")
[Fix]
+ The new way to do this is to collect all the quirk and auto detection method
in video_detect.c
+ I added an audo detection for the Dell AIO platoform to the driver which
should do the same thing as the old way.
[Test]
+ Verified on the Dell AIO platform and confirmed there is only on
dell_uart_backlight in the sysfs, and no acpi_video* interface.
[Where problems could occur]
+ There should be no regression potential, it uses different way to do the same
thing, should be pretty safe.
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https://bugs.launchpad.net/bugs/2008882
Title:
Remove all other acpi_video backlight interface on Dell AIO platforms
Status in HWE Next:
New
Status in linux package in Ubuntu:
In Progress
Status in linux-oem-6.1 package in Ubuntu:
Invalid
Status in linux source package in Jammy:
Invalid
Status in linux-oem-6.1 source package in Jammy:
In Progress
Status in linux source package in Lunar:
In Progress
Status in linux-oem-6.1 source package in Lunar:
Invalid
Bug description:
[Impact]
There are acpi_video* sysfs backlight interface in the system which are not
working.
For Dell AIO platforms, we use dell_uart_backlight to control the display
brightness.
The old way to fix this is to unregister acpi backlight interfaces in the
backlight driver, but it may lead to some issues and the unregister function
has been removed since v6.1-rc1
77ab9d4d44cd ("ACPI: video: Remove acpi_video_set_dmi_backlight_type()")
[Fix]
The new way to do this is to collect all the quirk and auto detection method
in video_detect.c
I added an audo detection for the Dell AIO platoform to the driver which
should do the same thing as the old way.
[Test]
Verified on the Dell AIO platform and confirmed there is only on
dell_uart_backlight in the sysfs, and no acpi_video* interface.
[Where problems could occur]
There should be no regression potential, it uses different way to do the same
thing, should be pretty safe.
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