> I wonder though if this is also a problem with the TV failing to sleep 
> correctly 
> and instead disconnecting from the computer... " 

I tried turning the TV off with the remote, then turning the TV back on.

Looks like the same (or similar) condition.

All the windows on the second display lost their geometry. I can see
them in the launcher view, but they are gone somewhere. Perhaps their
coordinates have traveled off-screen?

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https://bugs.launchpad.net/bugs/1892427

Title:
  [amdgpu] HDMI connected TV wakeup problems

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