Public bug reported: 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 ** Affects: linux (Ubuntu) Importance: Undecided Status: New ** Tags: amd64 apport-bug hirsute wayland-session ** Attachment added: "Ouput of ls /sys/class/backlight" https://bugs.launchpad.net/bugs/1934557/+attachment/5508768/+files/ls%20sys-class-backlight -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1934557 Title: Backlight (screen brightness) on Lenovo P14s AMD Gen2 inop To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1934557/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
