Bug#484087: Xorg log from crash under compiz

["Sander Marechal" <s.marechal@jejik.com>]

X.org went blank again. This time it happened when I was running compiz. My 
Xorg.0.log is attached. As before, restarting gdm didn't help. But, now I 
did see screen flashes under compiz as well so you can strike that from my 
list of symptoms/observations above.