this happens on my 32-bit Oneiric system as well, with and without proprietary AMD/ATI GPU drivers.
** Attachment added: "Xorg backtrace" https://bugs.launchpad.net/ubuntu/+source/xorg-server/+bug/877389/+attachment/2648626/+files/Xorg.0.log.old -- You received this bug notification because you are a member of Ubuntu-X, which is subscribed to xorg-server in Ubuntu. https://bugs.launchpad.net/bugs/877389 Title: Xorg crash on login screen To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/xorg-server/+bug/877389/+subscriptions _______________________________________________ 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