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

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

Filip Hejsek (filip.hejsek@xxxxxxxxx) changed:

           What    |Removed                     |Added
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                 CC|                            |filip.hejsek@xxxxxxxxx

--- Comment #29 from Filip Hejsek (filip.hejsek@xxxxxxxxx) ---
All the workarounds posted here are for a different bug:
https://bugzilla.kernel.org/show_bug.cgi?id=210263

There are three different problems:
- setting brightness doesn't work before showing something on display (the bug
linked above)
- actual_brightness has wrong range (this bug)
- kernel uses aux for backlight control on systems that don't support it

For the third problem, there is a patch in
https://bugzilla.opensuse.org/show_bug.cgi?id=1180749, and it seems to be
merged already. However, because there is no way yet to detect that aux
backlight doesn't work, the workaround has to be enabled with
amdgpu.aux_backlight=0 (assuming you have a kernel with the patch).

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