Thanks for the bug report. Next time the freeze happens please:
1. Replug the monitor to fix it.
2. Wait 10 seconds.
3. Run:
journalctl -b0 > journal.txt
lspci -k > lspci.txt
4. Attach the resulting text files here.
** Changed in: gnome-shell (Ubuntu)
Status: New => Incomplete
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https://bugs.launchpad.net/bugs/1971744
Title:
external monitor static image after unlocking session
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