Sadly, separate X server was a disaster. The smaller VGA monitor on the
right looked normal. The wider DVI monitor showed only a black
background and my cursor when I moved over. But no windows or other
activity.

I turned off the computer, unplugged the DVI monitor, and restarted.
Now, my single monitor is screwed up. I can see the background after
logging in, but no unity bar or top nav. Basically, it's busted. Not
sure how to fix it, but clearly something is messed in the NVIDIA
settings and xorg.conf.

FWIW, I worked for several days with only a single VGA monitor and had
no problems. I tried a single DVI monitor and had that crash. Not sure
what the means. Also, I have two other machines I watch that have dual
screen 11.10 installed. The other two are not crashing randomly this is
one is, but the xorg process in top is often running near 100% CPU. That
happened on this busted machine as well, and when I had it down to one
monitor the xorg was very tame.

So I've got this bug, the new problem introduced by the fix, and the
high CPU I've seen on the other machines. IMHO, there is probably
something screwed up with how 11.10 and Unity are dealing with dual
monitors. It's sad, because I love the new interface. Unfortunately,
it's hard to enjoy with my very basic Dell hardware.

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https://bugs.launchpad.net/bugs/882710

Title:
  Dual monitors randomly black out, might be linked to switching
  workspaces

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