Thanks. That confirms it was Xorg crashing, which might be the fault of
the radeon driver.
Also the missing mouse pointer is bug 1867080.
** Package changed: gnome-shell (Ubuntu) => xorg-server (Ubuntu)
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Okay after some experimenting
I found switching to Wayland brings up both monitors after login
But no mouse pointer
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https://bugs.launchpad.net/bugs/1865444
Title
Thanks. The only relevant error I can find in there is strange:
Mar 02 11:49:30 mel-Aspire-M5600-AM3600 gnome-shell[3916]: gnome-shell:
Fatal IO error 0 (Success) on X server :0.
and
Feb 29 20:58:53 mel-Aspire-M5600-AM3600 gnome-shell[3068]: gnome-shell:
Fatal IO error 11 (Resource temporarily u