Comment 22 for bug 1384512

I can confirm that I have this same issue as well. I'm having a similar experience to Peter

Quote: "It happens till a number of times when you just have to go to tty1 and do a reboot"

Something that I have noticed is that when the desktop is idle, for a while and then I come back to it it can be frozen. I also noticed that using Google Hangouts, the video freezes, every 5 minutes, and Alt+Tab is required to unfreeze.

My suspicion is that there might be something useful to be had by adjusting the screen locking timeout, and testing this now to see if it might help as a work around.

I should have some time next week, and if Libxext is still outstanding or packaging I'll take a crack at it.