You have been subscribed to a public bug:
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@backlight:amdgpu_bl0 service seems to fail during
startup, but I can subsequently run it after startup and it succeeds
(and restores brightness):
mdmower@T14S ~ $ sudo systemctl status systemd-backlight@backlight:amdgpu_bl0
[sudo] password for mdmower:
× systemd-backlight@backlight:amdgpu_bl0.service - Load/Save Screen Backlight
Brightness of backlight:amdgpu_bl0
Loaded: loaded (/lib/systemd/system/systemd-backlight@.service; static)
Active: failed (Result: exit-code) since Tue 2021-12-14 13:26:05 PST; 30s
ago
Docs: man:systemd-backlight@.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@backlight:amdgpu_bl0.service: Main process exited,
code=exited, status=1/FAILURE
Dec 14 13:26:05 T14S systemd[1]:
systemd-backlight@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@T14S ~ $ sudo systemctl start systemd-
backlight@backlight:amdgpu_bl0
mdmower@T14S ~ $ sudo systemctl status systemd-backlight@backlight:amdgpu_bl0
● systemd-backlight@backlight:amdgpu_bl0.service - Load/Save Screen Backlight
Brightness of backlight:amdgpu_bl0
Loaded: loaded (/lib/systemd/system/systemd-backlight@.service; static)
Active: active (exited) since Tue 2021-12-14 13:26:45 PST; 1s ago
Docs: man:systemd-backlight@.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
** Affects: linux (Ubuntu)
Importance: Undecided
Status: New
** Tags: amd64 apport-bug impish ubuntu wayland-session
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amdgpu_bl0: Failed to write system 'brightness' attribute: Invalid argument
https://bugs.launchpad.net/bugs/1954843
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