I have seen the error in step 10 before. In my case it was caused by bug
1874207 in mutter so maybe wait for that to be fixed...
Also, next time the external display is "unavailable" please open a
Terminal window and run 'xrandr'. Can you still see the external display
there?
** Tags added: nvidia
** Tags added: multimonitor
** Changed in: gnome-control-center (Ubuntu)
Status: New => Incomplete
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https://bugs.launchpad.net/bugs/1877226
Title:
nvidia - external display unavailable after screen goes to sleep
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