[Bug 59841] [IVB cpu eDP] panel is broken due to 657445fe86 (eDP bpp clamping)

[bugzilla-daemon at bugzilla.kernel.org]

https://bugzilla.kernel.org/show_bug.cgi?id=59841

--- Comment #97 from infernix at infernix.net ---
On XPS 13, brightness controls work out of the box on 3.9.0-rc7, 3.9.5 and
3.9.11; 3.10 is when the graphical corruption started to occur, and I haven't
had a fully working display since on any 3.10/3.11.

And when I'm saying it's broken on 3.11, I mean that 

a) buttons are functioning (e.g. Xorg shows a brightness popup that changes)
but have no effect, 
b) echo X > /sys/.../drm/card0/card0-eDP-1/intel_backlight/brightness has no
effect,
c) echo X > /sys/.../backlight/acpi_video0/brightness has no effect.

All of this works fine on any 3.9 kernel. I am merely assuming that this was
broken together with the graphical corruption problem.

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