Comment 69 for bug 1265544

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 <email address hidden>
> 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 ***