[Bug 90430] [HD4600 MST] DisplayPort MST crash with Dell M3800 laptop + Dell UP2414Q monitor

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=90430

--- Comment #12 from Tomasz Fortuna <bla at thera.be> ---
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.

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