Likely a dupe of one of the other gpu lockups with IPEHR 0x02000004, although difficult to say for sure.
Given that you don't think you're seeing any symptoms, my guess would be another instance of the vesafb bug (which isn't really X, but lower level components for managing the kernel drm modules). ** 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/748088 Title: i865 GPU lockup IPEHR: 0x02000004 - immediately after login -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs