Another bug has been sucking up my bug-fixing time, but I still plan to
file a new one.

For now, the main thing I have noted: restoring minimized windows with
the Alt-Grave key is where I get blank windows.  Restoring with the
mouse, or with plain Alt-Tab does not.  Alt-Grave does not do it every
time; usually within three cycles of minimize-restore.  It can happen,
on my system at least, when video memory is mostly free, according to
nvidia-smi.  I haven't been able to correlate the bug with video memory
levels, here.  Thanks.

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https://bugs.launchpad.net/bugs/938658

Title:
  [nvidia] Restoring minimized applications presents blank window

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