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

[bugzilla-daemon at bugzilla.kernel.org]

https://bugzilla.kernel.org/show_bug.cgi?id=210263

jaromir.obr at gmail.com changed:

           What    |Removed                     |Added
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                 CC|                            |jaromir.obr at gmail.com

--- Comment #6 from jaromir.obr at gmail.com ---
@Fabian
I have the same experience. I was running kernel 5.13 on Ubuntu 21.10 and when
I upgraded to mainline kernel 5.15.13 (using
https://github.com/pimlie/ubuntu-mainline-kernel.sh), the service
"systemd-backlight at backlight:amdgpu_bl0.service" starts as expected and
backlight seems to be restored.

With kernel 5.13 it failed: "Failed to start Load/Save Screen Backlight
Brightness of backlight:amdgpu_bl0" and I was not able to start it manually.

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