[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

Robert Abraham <robert.abraham86 at googlemail.com> changed:

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--- Comment #2 from Robert Abraham <robert.abraham86 at googlemail.com> ---
I have a similar problem. gmux_backlight/max_brightness is set to -1.
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.

i will happily provide any information you need.

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