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

[bugzilla-daemon@bugzilla.kernel.org]

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

--- Comment #8 from ninelore@protonmail.com ---
(In reply to Fabian from comment #5)
> As of Kernel 5.15, I don't need fbcon=nodefer anymore. By default the
> backlight works and is set on start. I still get from time to time an
> boot-error by systemd, but that can be also worked around by loading amdgpu
> early.
> 
> Can someone confirm this?

(In reply to jaromir.obr from comment #6)
> @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@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.

Can confirm this bug is fixed with 5.15

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