https://bugzilla.kernel.org/show_bug.cgi?id=210263
Bug ID: 210263 Summary: brightness device returns ENXIO (?) on brightness restore at boot, with bootoption "quiet" Product: Drivers Version: 2.5 Kernel Version: 5.9.8 Hardware: x86-64 OS: Linux Tree: Mainline Status: NEW Severity: normal Priority: P1 Component: Video(DRI - non Intel) Assignee: drivers_video-dri@kernel-bugs.osdl.org Reporter: plusfabi@gmail.com Regression: No
Created attachment 293729 --> https://bugzilla.kernel.org/attachment.cgi?id=293729&action=edit dmesg
Following: https://github.com/systemd/systemd/issues/17645
If I set kernel boot option "quiet", systemd fails to restore brightness level with error
Failed to start Load/Save Screen Backlight Brightness of backlight:amdgpu_bl0.
At boot.
full journal output is:
journalctl -b -1 -u systemd-backlight@backlight:amdgpu_bl0.service -- Logs begin at Thu 2020-09-17 08:15:00 CEST, end at Tue 2020-11-17 14:19:18 CET. -- Nov 17 14:15:15 frigg systemd[1]: Starting Load/Save Screen Backlight Brightness of backlight:amdgpu_bl0... Nov 17 14:15:15 frigg systemd-backlight[325]: amdgpu_bl0: Failed to write system 'brightness' attribute: No such device or address Nov 17 14:15:15 frigg systemd[1]: systemd-backlight@backlight:amdgpu_bl0.service: Main process exited, code=exited, status=1/FAILURE Nov 17 14:15:15 frigg systemd[1]: systemd-backlight@backlight:amdgpu_bl0.service: Failed with result 'exit-code'. Nov 17 14:15:15 frigg systemd[1]: Failed to start Load/Save Screen Backlight Brightness of backlight:amdgpu_bl0.
This is an AMD Renoir system, with AMD Ryzen 5 4500U APU,
This happens only, if I set 'quiet' as boot option. If I remove it, brightness restore works fine.
If I boot with quiet set, after login I can do
systemctl start systemd-backlight@backlight:amdgpu_bl0.service
And it will successfully restore my brightness level.