[Bug 73567] [915 Haswell ULT Asus UX302LA/LG] eDP bpp clamping results in blank screen

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=73567

--- Comment #13 from Alberto Aguirre <albaguirre at gmail.com> ---
Daniel, 

I'm already running drm-intel-nightly which includes that commit.
That particular hack does indeed run (see attached dmesg log at the beginning)
but the panel is still blank. I saw the same hack at intel_dp_get_config, but
in my machine intel_dp_get_config does not get called at all.

The culprit is clamping bpp from 24 to 18 bpp at intel_dp_compute_config. When
the bpp clamping code is disabled and the panel runs at 24 bpp there are no
more blank screen issues. 


(In reply to comment #4)
> We've had to duplicate the hack in the hsw code:
> 
> commit 1021442098ee9328fdd4d113d63a3a7f2f40c37b
> Author: Daniel Vetter <daniel.vetter at ffwll.ch>
> Date:   Mon Nov 18 07:38:16 2013 +0100
> 
>     drm/i915: Replicate BIOS eDP bpp clamping hack for hsw
> 
> *** This bug has been marked as a duplicate of bug 71049 ***

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