Andreas, you are probably running into this bug which is still current. https://bugs.freedesktop.org/show_bug.cgi?id=92911
A fix needs to be backported to wily. ** Bug watch added: freedesktop.org Bugzilla #92911 https://bugs.freedesktop.org/show_bug.cgi?id=92911 -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1522727 Title: X.org crashes intermittently, randomly, back to the login screen To manage notifications about this bug go to: https://bugs.launchpad.net/xserver-xorg-video-intel/+bug/1522727/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
