[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 #3 from Alex Deucher <alexdeucher at gmail.com> ---
(In reply to Robert Abraham from comment #2)
> 
> it works perfectly fine on 4.0.x kernel though.

The radeon backlight code hasn't really changed since it was added so
presumably something else did.  Can you bisect?  Since this is a mac, it's
possible the GPU driver does not actually control the backlight.  Everything is
a one off on macs.

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