It kind if sounds like the system is in partial sleep mode, or trying to
get there. And that would make sense because when the bug occurs the lid
is closed and you've disconnected the only other screen. So you're kind
of asking for screen hotplugging (or switching back to it on the KVM) to
wake the system. When you put it that way it's kind of not a bug, if the
theory is right...
Can you please run 'gnome-tweaks' and check that:
Gnome Tweaks > Power > Suspend when laptop lid is closed = OFF
?
** Package changed: xorg (Ubuntu) => ubuntu
** Changed in: ubuntu
Status: New => Incomplete
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which is subscribed to xorg in Ubuntu.
https://bugs.launchpad.net/bugs/1873510
Title:
Blank screen when hotplugging monitors connected through DisplayPort
dock
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