The xorg maintainer gave some directions for diagnosing the issue in comment #8. There's been two dozen comments since then but no one gave the info he requested...
In any case, judging from the comments this is a kernel bug (not X) and that if someone did a git bisect on the kernel they should be able to locate the patch that fixes it, and propose for inclusion in a stable kernel update, if you feel strongly about getting this fix into lucid. ** Changed in: xserver-xorg-video-intel (Ubuntu) Importance: Undecided => High ** Changed in: xserver-xorg-video-intel (Ubuntu) Status: Confirmed => Incomplete ** Also affects: xserver-xorg-video-intel (Ubuntu Lucid) Importance: Undecided Status: New -- You received this bug notification because you are a member of Ubuntu-X, which is subscribed to xserver-xorg-video-intel in Ubuntu. https://bugs.launchpad.net/bugs/528432 Title: [gm45] X crashes and restarts with *ERROR* Failed to pin buffer 4 of 17 _______________________________________________ Mailing list: https://launchpad.net/~ubuntu-x-swat Post to : ubuntu-x-swat@lists.launchpad.net Unsubscribe : https://launchpad.net/~ubuntu-x-swat More help : https://help.launchpad.net/ListHelp