Bug#666360: [3.2.6 -> 3.2.7 regression] i915: HDMI/DVI output broken on Dell Latitude E6410

[Jonathan Nieder <jrnieder@gmail.com>]

Hi Brice,

Brice Goglin wrote:

> 3.2.0-2-amd64 fails to start X on my Dell Latitude E6410 when my DVI
> monitor is connected to one of the HDMI/DVI outputs on the dock station.
> KMS starts fine, but X later fails to start and I see something like
> "failed to start CRTC:3" blinking on the screen.
>
> If I unplug the DVI monitor, no problem.
[...]
> So something broke between 3.2.6-1 and 3.2.9-1

Yeah, this is probably from

 commit 3d794f87238f
 Author: Keith Packard <keithp@keithp.com>
 Date:   Wed Jan 25 08:16:25 2012 -0800

     drm/i915: Force explicit bpp selection for intel_dp_link_required

     commit c898261c0dad617f0f1080bedc02d507a2fcfb92 upstream.

See also [1].  If you can reproduce this with 3.3 from experimental, I'd
suggest filing a bug upstream[2].  (Please let us know the bug number if
doing so so we can track it.)

Thanks,
Jonathan

[1] http://bugs.debian.org/658662
[2] http://intellinuxgraphics.org/how_to_report_bug.html