This bug seems to have the same symptoms as
https://bugs.launchpad.net/ubuntu/+source/mutter/+bug/1722353
i.e. the session crashes when an HDMI or DP connected monitor is turned back on.
Andrew
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I am having this issue despite having auto off feature disabled. The issue
doesnt start until my monitor is turned back on; I put my /var/log/syslog
entries here:
https://pastebin.com/QTe2QvHX
with this being where the segfault happens:
Oct 31 10:34:40 server kernel: [46047.363402]