[Bug 106228] amdgpu reads back brightness 0 (which is not true) if checked before a brightness has been explicitly set

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=106228

--- Comment #5 from Daniel Drake <dan at reactivated.net> ---
Created attachment 140809
  --> https://bugs.freedesktop.org/attachment.cgi?id=140809&action=edit
additional patch

this patch may also be required

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