[Bug 1954843] Re: amdgpu_bl0: Failed to write system 'brightness' attribute: Invalid argument

[Matthew D. Mower]

I just tested signed Ubuntu kernel 5.13.0-28-generic which is in
Proposed right now, but it does not fix the issue. Brightness
adjustments work, but service fails during startup and screen is at full
brightness every boot (at gdm and at GNOME 3 desktop).

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Title:
  amdgpu_bl0: Failed to write system 'brightness' attribute: Invalid
  argument

Status in linux package in Ubuntu:
  Confirmed
Status in systemd package in Ubuntu:
  Confirmed

Bug description:
  Ubuntu 21.10 does not succeed at setting the display brightness after
  booting (either to the GNOME login screen or to a logged-in user's
  desktop). The brightness is at its highest level until I adjust it
  with keyboard shortcuts or a GUI tool.

  The systemd-backlight at backlight:amdgpu_bl0 service seems to fail
  during startup, but I can subsequently run it after startup and it
  succeeds (and restores brightness):

  mdmower at T14S ~ $ sudo systemctl status systemd-backlight at backlight:amdgpu_bl0
  [sudo] password for mdmower: 
  × systemd-backlight at backlight:amdgpu_bl0.service - Load/Save Screen Backlight Brightness of backlight:amdgpu_bl0
       Loaded: loaded (/lib/systemd/system/systemd-backlight at .service; static)
       Active: failed (Result: exit-code) since Tue 2021-12-14 13:26:05 PST; 30s ago
         Docs: man:systemd-backlight at .service(8)
      Process: 962 ExecStart=/lib/systemd/systemd-backlight load backlight:amdgpu_bl0 (code=exited, status=1/FAILURE)
     Main PID: 962 (code=exited, status=1/FAILURE)
          CPU: 3ms

  Dec 14 13:26:05 T14S systemd[1]: Starting Load/Save Screen Backlight Brightness of backlight:amdgpu_bl0...
  Dec 14 13:26:05 T14S systemd-backlight[962]: amdgpu_bl0: Failed to write system 'brightness' attribute: Invalid argument
  Dec 14 13:26:05 T14S systemd[1]: systemd-backlight at backlight:amdgpu_bl0.service: Main process exited, code=exited, status=1/FAILURE
  Dec 14 13:26:05 T14S systemd[1]: systemd-backlight at backlight:amdgpu_bl0.service: Failed with result 'exit-code'.
  Dec 14 13:26:05 T14S systemd[1]: Failed to start Load/Save Screen Backlight Brightness of backlight:amdgpu_bl0.

  mdmower at T14S ~ $ sudo systemctl start systemd-
  backlight at backlight:amdgpu_bl0

  mdmower at T14S ~ $ sudo systemctl status systemd-backlight at backlight:amdgpu_bl0
  ● systemd-backlight at backlight:amdgpu_bl0.service - Load/Save Screen Backlight Brightness of backlight:amdgpu_bl0
       Loaded: loaded (/lib/systemd/system/systemd-backlight at .service; static)
       Active: active (exited) since Tue 2021-12-14 13:26:45 PST; 1s ago
         Docs: man:systemd-backlight at .service(8)
      Process: 5119 ExecStart=/lib/systemd/systemd-backlight load backlight:amdgpu_bl0 (code=exited, status=0/SUCCESS)
     Main PID: 5119 (code=exited, status=0/SUCCESS)
          CPU: 5ms

  Dec 14 13:26:45 T14S systemd[1]: Starting Load/Save Screen Backlight Brightness of backlight:amdgpu_bl0...
  Dec 14 13:26:45 T14S systemd[1]: Finished Load/Save Screen Backlight Brightness of backlight:amdgpu_bl0.

  ProblemType: Bug
  DistroRelease: Ubuntu 21.10
  Package: xorg 1:7.7+22ubuntu2
  ProcVersionSignature: Ubuntu 5.13.0-22.22-generic 5.13.19
  Uname: Linux 5.13.0-22-generic x86_64
  ApportVersion: 2.20.11-0ubuntu71
  Architecture: amd64
  BootLog: Error: [Errno 13] Permission denied: '/var/log/boot.log'
  CasperMD5CheckResult: pass
  CompositorRunning: None
  CurrentDesktop: ubuntu:GNOME
  Date: Tue Dec 14 13:29:38 2021
  DistUpgraded: Fresh install
  DistroCodename: impish
  DistroVariant: ubuntu
  ExtraDebuggingInterest: Yes
  GraphicsCard:
   Advanced Micro Devices, Inc. [AMD/ATI] Cezanne [1002:1638] (rev d1) (prog-if 00 [VGA controller])
     Subsystem: Lenovo Cezanne [17aa:5095]
  InstallationDate: Installed on 2021-12-12 (2 days ago)
  InstallationMedia: Ubuntu 21.10 "Impish Indri" - Release amd64 (20211012)
  MachineType: LENOVO 20XF004WUS
  ProcEnviron:
   TERM=xterm-256color
   PATH=(custom, no user)
   XDG_RUNTIME_DIR=<set>
   LANG=en_US.UTF-8
   SHELL=/bin/bash
  ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-5.13.0-22-generic root=UUID=859a72cc-a3fe-470f-b525-37b151408289 ro quiet splash vt.handoff=7
  SourcePackage: xorg
  Symptom: display
  UpgradeStatus: No upgrade log present (probably fresh install)
  dmi.bios.date: 11/08/2021
  dmi.bios.release: 1.14
  dmi.bios.vendor: LENOVO
  dmi.bios.version: R1NET44W (1.14)
  dmi.board.asset.tag: Not Available
  dmi.board.name: 20XF004WUS
  dmi.board.vendor: LENOVO
  dmi.board.version: SDK0J40697 WIN
  dmi.chassis.asset.tag: No Asset Information
  dmi.chassis.type: 10
  dmi.chassis.vendor: LENOVO
  dmi.chassis.version: None
  dmi.ec.firmware.release: 1.14
  dmi.modalias: dmi:bvnLENOVO:bvrR1NET44W(1.14):bd11/08/2021:br1.14:efr1.14:svnLENOVO:pn20XF004WUS:pvrThinkPadT14sGen2a:rvnLENOVO:rn20XF004WUS:rvrSDK0J40697WIN:cvnLENOVO:ct10:cvrNone:skuLENOVO_MT_20XF_BU_Think_FM_ThinkPadT14sGen2a:
  dmi.product.family: ThinkPad T14s Gen 2a
  dmi.product.name: 20XF004WUS
  dmi.product.sku: LENOVO_MT_20XF_BU_Think_FM_ThinkPad T14s Gen 2a
  dmi.product.version: ThinkPad T14s Gen 2a
  dmi.sys.vendor: LENOVO
  version.compiz: compiz N/A
  version.libdrm2: libdrm2 2.4.107-8ubuntu1
  version.libgl1-mesa-dri: libgl1-mesa-dri 21.2.2-1ubuntu1
  version.libgl1-mesa-glx: libgl1-mesa-glx N/A
  version.xserver-xorg-core: xserver-xorg-core 2:1.20.13-1ubuntu1
  version.xserver-xorg-input-evdev: xserver-xorg-input-evdev N/A
  version.xserver-xorg-video-ati: xserver-xorg-video-ati 1:19.1.0-2build1
  version.xserver-xorg-video-intel: xserver-xorg-video-intel 2:2.99.917+git20200714-1ubuntu2
  version.xserver-xorg-video-nouveau: xserver-xorg-video-nouveau 1:1.0.17-1build1

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