Comment 1 for bug 1008808

I could reproduce this also on my Laptop just after resume from suspend, which is running precise but has a different video card (Intel vs Nvidia). I guess this excludes a driver bug. Other observations:

 - The compiz process keeps running and seems to be talking to X
 - The mouse cursor changes shape near the center of the screen, where the password prompt usually is
 - I don't see "/usr/bin/python /usr/bin/unity" in the process list. maybe it has crashed?
 - It's quite hard to trigger on the laptop... I've seen it maybe twice
 - The desktop is a new install, the laptop has been upgraded from oneiric
 - Both the desktop and the laptop have similar compiz settings. They're pretty close to defaults, except that i configured 4 virtual desktops horizontally and enabled the Desktop Wall plugin.