The bug you point to is about KWin crashing, not the entire xsession. Incidentially enough crashing X suggests that something is fishy with the driver/opengl in general.
** No longer affects: kde-workspace (Ubuntu) -- You received this bug notification because you are a member of Kubuntu Bugs, which is subscribed to kde-workspace in Ubuntu. https://bugs.launchpad.net/bugs/777019 Title: xorg-server crashes when using openGL enabled apps. To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/xorg-server/+bug/777019/+subscriptions -- kubuntu-bugs mailing list kubuntu-b...@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/kubuntu-bugs