Comment 31 for bug 762918

I've been having the same problem as well. My machine is using the onboard graphics of an Intel H67 sandybridge motherboard. Based off micred's comment of it possibly being the same issue as in Bug 780653, I tried enabling the option "Lock screen when screensaver is active" in the screensaver settings. After that I haven't had the screen exhibit the same behaviour as everyone else has mentioned.