Christopher M. Penalver,

I'm afraid the issue is still there and has been since at least Ubuntu
10.10.

After installing Ubuntu 12.04-beta2 on a flashdisk and package update
yesterday, I still get screen blank and sleep issues, that eventually
end in a lockup. Some of these issues might easily be X, Compiz, Mesa or
Unity bugs.

Blank doesn't really work, as it does a fake switch to console, while
keeping the mouse cursor active and waking up the disabled internal
monitor. I have to do a switch to a real console and back to get to my X
session. Display sleep works, but sometimes, especially after a longer
sleep period, it won't wake up. Also, when I leave both monitors
enabled, windows tend to move from external monitor to internal after
blank/sleep - wake up. But this should be a Compiz/Unity issue.

Moreover, during this bug update i found another bug message in dmesg.
This time the system survived. Running apport again.

Will try mainline kernel later.

PS: Apport crashed on me during the first bug update today, so some
things might be damaged or missing.

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https://bugs.launchpad.net/bugs/747187

Title:
  Kernel BUG at
  /build/buildd/linux-2.6.35/drivers/gpu/drm/i915/i915_gem.c:4224!

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