[Bug 94605] [SKL] Flashing black screen ([drm:intel_cpu_fifo_underrun_irq_handler [i915]] *ERROR* CPU pipe A FIFO underrun)

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=94605

--- Comment #72 from Florian Kaiser <florian.kaiser at mpcdf.mpg.de> ---
I was experiencing the same issues (logs attached) - display randomly going
blank for a short time while working (moving the mouse around etc.) with
corresponding underruns in the kernel log.

Environment: 
Dell OptiPlex 7040/0Y7WYT with i7-6700 CPU
2x Dell U2415 displays connected via DP
OpenSUSE Leap 42.1 kernel 4.1.31-30-default and vanilla 4.8.0
2x 16GB DIMMs as well, however removing one of them didn't change anything

The nightly from 10/16/2016 seems to have fixed or at least greatly reduced it
for me: Before the error happened multiple times an hour. With the nightly so
far after one day, I haven't had the error while working.

However, I can still trigger the same (or a similar?) error by switching my
displays off and on again:

# With nightly 4.8.0-drm-intel-20161016
Oct 18 13:36:59 fekpc org.kde.KScreen[1734]: kscreen.xrandr: Output 68 :
connected = false , enabled = true
Oct 18 13:37:00 fekpc org.kde.KScreen[1734]: kscreen.xrandr: Emitting
configChanged()
Oct 18 13:37:00 fekpc org.kde.KScreen[1734]: kscreen: Primary output changed
from KScreen::Output(Id: 67 , Name: "DP1" ) ( "DP1" ) to KScreen::Output(Id: 67
, Name: "DP1" ) ( "DP1" )
Oct 18 13:37:00 fekpc kernel: [drm:intel_cpu_fifo_underrun_irq_handler [i915]]
*ERROR* CPU pipe B FIFO underrun

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