Backlight (screen brightness) on Lenovo P14s AMD Gen2 inop
Affects | Status | Importance | Assigned to | Milestone | |
---|---|---|---|---|---|
HWE Next |
Fix Released
|
Undecided
|
Unassigned | ||
linux (Ubuntu) |
Fix Released
|
Undecided
|
AaronMa | ||
Hirsute |
Fix Released
|
Undecided
|
Unassigned | ||
Impish |
Fix Released
|
Undecided
|
AaronMa | ||
linux-oem-5.10 (Ubuntu) |
Invalid
|
Undecided
|
Unassigned | ||
Focal |
Fix Released
|
Undecided
|
Unassigned | ||
linux-oem-5.13 (Ubuntu) |
Invalid
|
Undecided
|
Unassigned | ||
Focal |
Fix Released
|
Undecided
|
Unassigned |
Bug Description
Backlight does not change. Neither with the keys, nor with the slider. Values in /sys/class/
Following the instructions from here: https:/
ProblemType: Bug
DistroRelease: Ubuntu 21.04
Package: linux-image-
ProcVersionSign
Uname: Linux 5.11.0-22-generic x86_64
ApportVersion: 2.20.11-0ubuntu65.1
Architecture: amd64
AudioDevicesInUse:
USER PID ACCESS COMMAND
/dev/snd/
/dev/snd/pcmC2D0p: simon 1886 F...m pulseaudio
/dev/snd/
/dev/snd/
CasperMD5CheckR
CurrentDesktop: ubuntu:GNOME
Date: Sat Jul 3 09:46:53 2021
InstallationDate: Installed on 2021-07-03 (0 days ago)
InstallationMedia: Ubuntu 21.04 "Hirsute Hippo" - Release amd64 (20210420)
MachineType: LENOVO 21A0CTO1WW
ProcEnviron:
TERM=xterm-
PATH=(custom, no user)
XDG_RUNTIME_
LANG=de_DE.UTF-8
SHELL=/bin/bash
ProcFB: 0 amdgpudrmfb
ProcKernelCmdLine: BOOT_IMAGE=
RelatedPackageV
linux-
linux-
linux-firmware 1.197.1
SourcePackage: linux
UpgradeStatus: No upgrade log present (probably fresh install)
dmi.bios.date: 04/23/2021
dmi.bios.release: 1.5
dmi.bios.vendor: LENOVO
dmi.bios.version: R1MET35W (1.05 )
dmi.board.
dmi.board.name: 21A0CTO1WW
dmi.board.vendor: LENOVO
dmi.board.version: Not Defined
dmi.chassis.
dmi.chassis.type: 10
dmi.chassis.vendor: LENOVO
dmi.chassis.
dmi.ec.
dmi.modalias: dmi:bvnLENOVO:
dmi.product.family: ThinkPad P14s Gen 2a
dmi.product.name: 21A0CTO1WW
dmi.product.sku: LENOVO_
dmi.product.
dmi.sys.vendor: LENOVO
==============
SRU justification:
[Impact]
backlight can't be controlled on AMD platform.
[Fix]
AUX doesn't work on HDR panel, fallback to PWM mode to make backlight be controlled.
[Test]
Verified on hardware, backlight brightness works fine.
[Where problems could occur]
It may break backlight control on AMD platform.
CVE References
description: | updated |
tags: | added: oem-priority originate-from-1933579 sutton |
no longer affects: | linux-oem-5.13 (Ubuntu Hirsute) |
no longer affects: | linux-oem-5.13 (Ubuntu Impish) |
no longer affects: | linux-oem-5.10 (Ubuntu Hirsute) |
no longer affects: | linux-oem-5.10 (Ubuntu Impish) |
no longer affects: | linux (Ubuntu Focal) |
Changed in linux-oem-5.10 (Ubuntu Focal): | |
status: | New → Fix Committed |
Changed in linux (Ubuntu Hirsute): | |
status: | New → Fix Committed |
Changed in linux-oem-5.13 (Ubuntu Focal): | |
status: | New → Fix Committed |
Changed in linux-oem-5.10 (Ubuntu): | |
status: | New → Invalid |
Changed in linux-oem-5.13 (Ubuntu): | |
status: | New → Invalid |
Changed in hwe-next: | |
status: | New → Fix Released |
Hi Simon:
You got this laptop a bit earlier.
This issue is in progress.
Also could you upload the panel EDID?
$ sudo apt install read-edid
$ sudo get-edid > p14s2a.edid