Actually this isn't really an X bug, although it looks like it from the symptoms.
What's really going on is some other process on your system is consuming all the video memory (perhaps by polling the xserver with redraw requests or something). Eventually the video memory is exhausted, and that prevents X from running. The error messages you show are really typical for this type of scenario. Try identifying what client app is going rogue and causing the X server to die. ** Changed in: xserver-xorg-video-intel (Ubuntu) Status: New => Invalid -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/769977 Title: Sudden video crash on intel chipset -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs