This sounds crazy, but this seems to happen much more frequently when I
have, or am interacting with, a terminal or emacs in the second/external
screen. The resolution of the display is huge, so these windows tend to
be a small fraction of the display.
Also, I think it's actually only the external screen which is going black.
However, it started very clearly right when I upgraded.
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https://bugs.launchpad.net/bugs/1658497
Title:
Screens all flash to black for ~1 s periodically under extended
desktop
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