Consulted the bug on #gnome-shell IRC.
Next step is to track down the event that actually triggers execution of
cogl_glib_source_dispatch. It's possible it simply does not arrive. BTW, this
does not rule out Xorg as potential culprit, it might be simply not delivering
the expected event. This
** Summary changed:
- xorg lock-up on GPU hotplug
+ Gnome Shell lock-up on GPU hotplug
** Changed in: mutter (Ubuntu)
Status: Incomplete => New
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