I can't see anything immediately wrong in that log. Next time the problem happens please note the exact time it happened at, and then collect a new log covering that time period:
journalctl -b0 > journal.txt -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1972059 Title: One screen does not come back from lock To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/mutter/+bug/1972059/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
