[Bug 108668] drm/amd/display: set backlight level limit to 1: breaks userspace programs assuming 0 is the minimum brightness

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=108668

--- Comment #1 from Samantha McVey <samantham at posteo.net> ---
In addition, even though there is a write error, when you read back the
brightness value, it shows that the backlight is at level 0, while its
brightness has actually been unchanged from before:

echo 0 >
/sys/devices/pci0000:00/0000:00:08.1/0000:05:00.0/backlight/amdgpu_bl0/brightness
bash: echo: write error: Invalid argument

cat
/sys/devices/pci0000:00/0000:00:08.1/0000:05:00.0/backlight/amdgpu_bl0/brightness
0

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