[Bug 203905] amdgpu:actual_brightness has unreal/wrong value

[bugzilla-daemon at bugzilla.kernel.org]

https://bugzilla.kernel.org/show_bug.cgi?id=203905

--- Comment #32 from Filip Hejsek (filip.hejsek at gmail.com) ---
The acpi_video error seems to be
https://github.com/systemd/systemd/issues/15329 - first the ACPI driver creates
acpi_video1 device, then amdgpu removes it in favor of amdgpu_bl1, but systemd
still tries to set brightness on the removed device (which fails). You can
remove the error by masking `systemd-backlight at backlight:acpi_video1.service`.

The amdgpu_bl1 error is probably the bug i linked earlier -
https://bugzilla.kernel.org/show_bug.cgi?id=210263. Do you have silent boot? If
yes, you need to print something to console before setting backlight during
boot. You can use the workaround i posted here:
https://bbs.archlinux.org/viewtopic.php?pid=1971198#p1971198. If you use my
workaround, make sure to remove other workarounds you may have applied for that
error (like another service that runs systemctl start
systemd-backlight at backlight:amdgpu_bl0).

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