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<b><a class="bz_bug_link
bz_status_NEW "
title="NEW - [HD4600 MST] DisplayPort MST crash with Dell M3800 laptop + Dell UP2414Q monitor"
href="https://bugs.freedesktop.org/show_bug.cgi?id=90430#c12">Comment # 12</a>
on <a class="bz_bug_link
bz_status_NEW "
title="NEW - [HD4600 MST] DisplayPort MST crash with Dell M3800 laptop + Dell UP2414Q monitor"
href="https://bugs.freedesktop.org/show_bug.cgi?id=90430">bug 90430</a>
from <span class="vcard"><a class="email" href="mailto:bla@thera.be" title="Tomasz Fortuna <bla@thera.be>"> <span class="fn">Tomasz Fortuna</span></a>
</span></b>
<pre>I can reproduce the error on my setup:
- zbook 14 with intel/radeon switcheroo
- trying to use MST using some `renkforce' dongle
ii xserver-xorg-video-intel 2:2.99.917+git20160706-1
Kernel: 4.7.8 (self-compiled Debian testing/Stretch kernel)
I get:
[ 140.782715] [drm:intel_set_cpu_fifo_underrun_reporting [i915]] *ERROR*
uncleared fifo underrun on pipe B
[ 140.782741] [drm:ironlake_irq_handler [i915]] *ERROR* CPU pipe B FIFO
underrun
xrandr shows correctly detected displays and I can get ONE to turn on by first
going for 800x600 resolution and then changing to 1920x1080. But it flickers
from time to time.</pre>
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