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On Kubuntu 15.10, KDE Framework 5.18.0, Qt 5.5.1, kernel
4.4.1-040401-generic from http://kernel.ubuntu.com/~kernel-ppa/mainline/
(I upgraded hoping it would solve the problem, but it did not). Haswell
i7-4771 with integrated GPU (no other graphics card). 3-monitor setup.
Several times a day the display seems to crash in various ways, some
recoverable (e.g. by restarting plasmashell or sddm) but sometimes a
monitor stays blank, corrupt or unresponsive and only a full reboot
helps. I also see a plasma crash dialog every time I return to my
desktop after the screens went into power-savings mode when I was away
(I don't know if this is related or a plasma bug). It also happens
sometimes while dragging a windows (desktop effects are on), while
watching a video (I now get occasionally a few seconds with black output
in the middle of the video too). It's hard to pinpoint which components
are unstable, likely more than one, but this is a starting point since I
get the following message in dmesg which I assume is at a lower level
than the desktop environment (correct me if I'm wrong):
[Thu Feb 4 10:44:20 2016] [drm:intel_set_cpu_fifo_underrun_reporting [i915]]
*ERROR* uncleared fifo underrun on pipe A
[Thu Feb 4 10:44:20 2016] [drm:intel_cpu_fifo_underrun_irq_handler [i915]]
*ERROR* CPU pipe A FIFO underrun
** Affects: xorg (Ubuntu)
Importance: Low
Status: Incomplete
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[drm:intel_cpu_fifo_underrun_irq_handler [i915]] *ERROR* CPU pipe A FIFO
underrun
https://bugs.launchpad.net/bugs/1541751
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