https://bugs.freedesktop.org/show_bug.cgi?id=106228
--- Comment #6 from jian-h...@endlessm.com ---
Apply "[PATCH] drm/amdgpu: Read back max backlight value at boot" to Linux
4.18.0-rc6 kernel.
I disable all of the brightness setting applications, including masking
systemd-backlight service and than reboot.
"cat /sys/class/backlight/amdgpu_bl0/brightness" before set brightness manually
again and it reads back 255 (the maximum brightness).
If I unmask systemd-backlight service and than reboot for test, "cat
/sys/class/backlight/amdgpu_bl0/brightness" before set brightness manually
again and it reads back the brightness which is saved before last reboot.
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