I keep experiencing this issue, using Ubuntu 17.10, an Intel Core
i3-5005U (with Intel HD 5500). It appears most often when a new
notification comes in (Slack/Spotify) and the lockscreen is visible.

>From dmesg:
[Fri Feb 23 13:51:50 2018] [drm:intel_cpu_fifo_underrun_irq_handler [i915]] 
*ERROR* CPU pipe A FIFO underrun

$ uname -a
Linux uk-it-033 4.13.0-36-generic #40-Ubuntu SMP Fri Feb 16 20:07:48 UTC 2018 
x86_64 x86_64 x86_64 GNU/Linux

If you need any further information, please let me know.

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https://bugs.launchpad.net/bugs/1550779

Title:
  [i915]] *ERROR* CPU pipe A FIFO underrun - Xorg glitches

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