Does the situation improve if you add this to /etc/environment?;
MUTTER_DEBUG_ENABLE_ATOMIC_KMS=0
Does it at least replace the freeze with just one black screen?
** Changed in: gnome-shell (Ubuntu)
Status: Incomplete => Confirmed
** Changed in: mutter (Ubuntu)
Status: Incomplete => Confirmed
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https://bugs.launchpad.net/bugs/1970495
Title:
Window manager freezes when plugging in USB-C dock with external
monitor.
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