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<body><span class="vcard"><a class="email" href="mailto:imre.deak@intel.com" title="Imre Deak <imre.deak@intel.com>"> <span class="fn">Imre Deak</span></a>
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<a class="bz_bug_link
bz_status_NEW "
title="NEW - Dell XPS15 (HD530 & GeForce 950) external screen via dock/HDMI no text display & gdm freeze"
href="https://bugs.freedesktop.org/show_bug.cgi?id=111502">bug 111502</a>
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<td>ville.syrjala@linux.intel.com
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<b><a class="bz_bug_link
bz_status_NEW "
title="NEW - Dell XPS15 (HD530 & GeForce 950) external screen via dock/HDMI no text display & gdm freeze"
href="https://bugs.freedesktop.org/show_bug.cgi?id=111502#c8">Comment # 8</a>
on <a class="bz_bug_link
bz_status_NEW "
title="NEW - Dell XPS15 (HD530 & GeForce 950) external screen via dock/HDMI no text display & gdm freeze"
href="https://bugs.freedesktop.org/show_bug.cgi?id=111502">bug 111502</a>
from <span class="vcard"><a class="email" href="mailto:imre.deak@intel.com" title="Imre Deak <imre.deak@intel.com>"> <span class="fn">Imre Deak</span></a>
</span></b>
<pre>Could you check if your kernel has
commit bb1a71f9c4672fbfcf2158fd57d0c5c0cdae5612
Author: Ville Syrjälä <<a href="mailto:ville.syrjala@linux.intel.com">ville.syrjala@linux.intel.com</a>>
Date: Wed Aug 28 13:20:59 2019 +0300
drm/i915: Limit MST to <= 8bpc once again
and if not retry with that patch applied?
In your case the MST modeset fails with >8bpc mode:
[ 3.638886] [drm:drm_dp_mst_atomic_check [drm_kms_helper]] [MST
PORT:00000000400f0099] requires 65 vcpi slots
[ 3.638888] [drm:drm_dp_mst_atomic_check [drm_kms_helper]] [MST
PORT:00000000400f0099] not enough VCPI slots in mst state 0000000007efd79c
(avail=63)
...
[ 3.639117] [drm:intel_plane_destroy [i915]] cpu_transcoder: B, pipe bpp:
36, dithering: 0
The failure shouldn't cause a machine hang, but it's worth trying if the
failure path leads to it somehow. Your case is also only about 1 MST stream,
unlike the case the above commit fixes, so looks like we also calculate the
available bandwidth incorrectly.
Adding Ville for more ideas.</pre>
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