Backlight does not change. Neither with the keys, nor with the slider. Values in /sys/class/backlight/amdgpu_bl0/brightness do change. However without effect on the actual brightness of the screen, which seems to be stuck at maximum brightness.
Following the instructions from here: https://wiki.ubuntu.com/Kernel/Debugging/Backlight
ProblemType: Bug DistroRelease: Ubuntu 21.04 Package: linux-image-5.11.0-22-generic 5.11.0-22.23 ProcVersionSignature: Ubuntu 5.11.0-22.23-generic 5.11.21 Uname: Linux 5.11.0-22-generic x86_64 ApportVersion: 2.20.11-0ubuntu65.1 Architecture: amd64 AudioDevicesInUse: USER PID ACCESS COMMAND /dev/snd/controlC2: simon 1886 F.... pulseaudio /dev/snd/pcmC2D0p: simon 1886 F...m pulseaudio /dev/snd/controlC1: simon 1886 F.... pulseaudio /dev/snd/controlC0: simon 1886 F.... pulseaudio CasperMD5CheckResult: pass 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-256color PATH=(custom, no user) XDG_RUNTIME_DIR=<set> LANG=de_DE.UTF-8 SHELL=/bin/bash ProcFB: 0 amdgpudrmfb ProcKernelCmdLine: BOOT_IMAGE=/vmlinuz-5.11.0-22-generic root=/dev/mapper/vgubuntu-root ro quiet splash vt.handoff=7 RelatedPackageVersions: linux-restricted-modules-5.11.0-22-generic N/A linux-backports-modules-5.11.0-22-generic N/A 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.asset.tag: Not Available dmi.board.name: 21A0CTO1WW dmi.board.vendor: LENOVO dmi.board.version: Not Defined dmi.chassis.asset.tag: No Asset Information dmi.chassis.type: 10 dmi.chassis.vendor: LENOVO dmi.chassis.version: None dmi.ec.firmware.release: 1.5 dmi.modalias: dmi:bvnLENOVO:bvrR1MET35W(1.05):bd04/23/2021:br1.5:efr1.5:svnLENOVO:pn21A0CTO1WW:pvrThinkPadP14sGen2a:rvnLENOVO:rn21A0CTO1WW:rvrNotDefined:cvnLENOVO:ct10:cvrNone: dmi.product.family: ThinkPad P14s Gen 2a dmi.product.name: 21A0CTO1WW dmi.product.sku: LENOVO_MT_21A0_BU_Think_FM_ThinkPad P14s Gen 2a dmi.product.version: ThinkPad P14s Gen 2a dmi.sys.vendor: LENOVO
Backlight does not change. Neither with the keys, nor with the slider. Values in /sys/class/ backlight/ amdgpu_ bl0/brightness do change. However without effect on the actual brightness of the screen, which seems to be stuck at maximum brightness.
Following the instructions from here: https:/ /wiki.ubuntu. com/Kernel/ Debugging/ Backlight
ProblemType: Bug 5.11.0- 22-generic 5.11.0-22.23 ature: Ubuntu 5.11.0- 22.23-generic 5.11.21 controlC2: simon 1886 F.... pulseaudio controlC1: simon 1886 F.... pulseaudio controlC0: simon 1886 F.... pulseaudio esult: pass 256color DIR=<set> /vmlinuz- 5.11.0- 22-generic root=/dev/ mapper/ vgubuntu- root ro quiet splash vt.handoff=7 ersions: restricted- modules- 5.11.0- 22-generic N/A backports- modules- 5.11.0- 22-generic N/A asset.tag: Not Available asset.tag: No Asset Information version: None firmware. release: 1.5 bvrR1MET35W( 1.05):bd04/ 23/2021: br1.5:efr1. 5:svnLENOVO: pn21A0CTO1WW: pvrThinkPadP14s Gen2a:rvnLENOVO :rn21A0CTO1WW: rvrNotDefined: cvnLENOVO: ct10:cvrNone: MT_21A0_ BU_Think_ FM_ThinkPad P14s Gen 2a version: ThinkPad P14s Gen 2a
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