Thanks for the bug report. Issues like this are almost always caused by
a bad cable, bad connection, or by using intermediate adapters. So
ideally please try a new cable.
Also, next time the problem happens please then run:
journalctl -b0 > journal.txt
and attach the resulting text file here.
** Package changed: xorg (Ubuntu) => linux (Ubuntu)
** Changed in: linux (Ubuntu)
Status: New => Incomplete
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https://bugs.launchpad.net/bugs/1929209
Title:
external monitor goes black for several seconds at a time, randomly
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