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[amichair <1541751@xxxxxxxxxxxxxxxxxx>]

Note to self (apparently): A workaround that brings back the windows
without losing any data from open apps, at least in some cases, is
running "DISPLAY=:0 kwin_x11 --replace" from the terminal (ctrl-alt-f1).

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https://bugs.launchpad.net/bugs/1541751

Title:
  [drm:intel_cpu_fifo_underrun_irq_handler [i915]] *ERROR* CPU pipe A
  FIFO underrun

Status in xserver-xorg-video-intel package in Ubuntu:
  New

Bug description:
  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

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