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

[Nick Rosbrook]

According to the last comment, this was fixed by upgrading to 22.04.

** Changed in: systemd (Ubuntu)
       Status: Confirmed => Invalid

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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:
  Invalid

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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