Taking a screenshot definitely triggers this for me, although it also
happens on other occasions.
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https://bugs.launchpad.net/bugs/1971428
Title:
CPU pipe A FIFO underrun
Same here on my Dell XPS 13 with i915 graphics. Occasionally it gets
worse: my screen goes completely black and won't come back on unless I
switch to an external monitor and back, or reboot.
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