[Bug 105051] Radeon sets max_brightness to -1, breaking GNOME backlight control on Macbook Pro mid-2015 11,5

[bugzilla-daemon at bugzilla.kernel.org]

https://bugzilla.kernel.org/show_bug.cgi?id=105051

--- Comment #7 from Alex Deucher <alexdeucher at gmail.com> ---
Perhaps the radeon driver should just not attempt to register a backlight
interface on Macs since they seem to use the gmux for backlight control.  Some
one with more knowledge of mac hw should probably comment on how they should be
handled.

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