I also have an IBM Thinkpad X41. I'm affected with the same bug : X hangss, the mouse cursor in moving. The only thing I can do is connecting to my PC with ssh to reboot it. Here are debug information when the bug append this morning.
** Attachment added: "dri_debug-20091202.tgz" http://launchpadlibrarian.net/36325592/dri_debug-20091202.tgz -- [i915gm] [jaunty,karmic] X freezes every day or so https://bugs.launchpad.net/bugs/438346 You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs