Thanks for the bug report. Are the flashes light or dark?
Next time it happens, please immediately run:
journalctl -b0 > journal.txt
lspci -kv > lspci.txt
and attach the resulting text files here.
** Changed in: gnome-shell (Ubuntu)
Status: New => Incomplete
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https://bugs.launchpad.net/bugs/1948778
Title:
Random flashes in gnome-shell
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