[Bug 210263] New: brightness device returns ENXIO (?) on brightness restore at boot, with bootoption "quiet"

[bugzilla-daemon@xxxxxxxxxxxxxxxxxxx]

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@xxxxxxxxxxxxxxxxxxxx
          Reporter: plusfabi@xxxxxxxxx
        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.

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