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

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

--- Comment #5 from Tim Sammut <tim.sammut@xxxxxxxxx> ---
(In reply to Robert Abraham from comment #2)
> But i also have a radeon_bl entry in /sys/class/backlight which has the
> correct values.
> But no matter which value i echo into
> /sys/class/backlight/radeon_bl/brightness i am on max brightness, except i
> echo 0. in this case the backlight turns off.
> 
> so i can only choose between backlight off or on max brightness.
> it works perfectly fine on 4.0.x kernel though.

Just for the record, this is precise how my machine behaves as well.

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