[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

Felipe Ortiz <fortizc at gmail.com> changed:

           What    |Removed                     |Added
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                 CC|                            |fortizc at gmail.com

--- Comment #14 from Felipe Ortiz <fortizc at gmail.com> ---
I can confirm the problem with 4eebd5a4e72697aac25a8a57d3f888a9d5f80370. I have
a MPB 11,5 with AMD/Intel graphics. I recompile the module (a previous version
of 4eebd5a4e72697aac25a8a57d3f888a9d5f80370) and brightness adjusts is working
again.

I see two problems: 

1) If someone uses gpu-switch (https://github.com/0xbb/gpu-switch) with this
bug screen seem not work, after severals reboots (with different kernels) I can
access a terminal and execute gpu-switch -d and then screen seems work again.

2) If you use a Intel card (swiched with gpu-switch) the OSD (activated with
functions keys) is so slow and chromium have the same problem (temporary fix is
deactivate chromium hw acceleration) is this a intel driver bug?

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