Thanks for the bug report. Next time the bug happens please run:
journalctl -b0 > journal.txt
and attach the resulting text file here.
Please also try selecting 'Ubuntu on Xorg' at the login screen and tell
us if it has the same problem.
** Package changed: xorg (Ubuntu) => mutter (Ubuntu)
** Changed in: mutter (Ubuntu)
Status: New => Incomplete
** Tags added: i915 multimonitor
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https://bugs.launchpad.net/bugs/1972059
Title:
One screen does not come back from lock
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