Comment # 6 on bug 75357 from oogway.droid@gmail.com

I've disabled ColorTiling2D now. Will report back soon.
One observation is that when I disable monitor power saving in 
Gnome Settings (Power->Blank Screen->Never), I did not hit the issue.
Although I tested only for about 12 hours. Without this I usually get
the black screen on resuming the monitor from power saving mode in 
about 1 or 2 hours.