[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 #7 from jian-hong at endlessm.com ---
Applied both "[PATCH] drm/amdgpu: Read back max backlight value at boot" and
"[PATCH] drm/amd/display: Implement backlight_ops.get_brightness" to Linux
4.18.0-rc6 kernel.

I got the same behavior as previous comment.

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