I was having the same problem and fixed it by turning on uxa. Details on how to do that are here
https://wiki.ubuntu.com/X/UxaTesting -- ubuntu crash & restart itself when playing video in totem movie player and at the same time clicking on anything/ anywhere outside of the player https://bugs.launchpad.net/bugs/407609 You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
