https://bugs.freedesktop.org/show_bug.cgi?id=109375

--- Comment #1 from Rafał Miłecki <zajec5@gmail.com> ---
For a comparison: behavior with the commit 262485a50fd4~1 (before the
regression):

Before suspend:
> cat /sys/class/backlight/amdgpu_bl0/{actual_brightness,brightness}
255
255

After resume:
> cat /sys/class/backlight/amdgpu_bl0/{actual_brightness,brightness}
250
255

Looks like a problem with amdgpu restoring backlight after resume.

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