Did your screen freeze or did it kick you back to the login prompt? I have had a random issue of waking from suspend and then after a minute or 2 getting kicked out to the login prompt. I have a similar backtrace in my /var/logXorg.0.log.old file.
Fom me this happening with a Thinkpad T520 with Intel graphics. I see you have AMD tagged, so I don't match with you there. I asked a "question" on launchpad here: https://answers.launchpad.net/ubuntu/+source/xorg/+question/203802 iveand -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1026777 Title: Xorg segfault To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/xorg/+bug/1026777/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
