This looks to be a lightdm bug; X seems to have come up fine, then the greeter quits, lightdm asks the server to regenerate, then lightdm goes walkabout.
** Package changed: xorg (Ubuntu) => lightdm (Ubuntu) -- You received this bug notification because you are a member of Ubuntu-X, which is subscribed to xorg in Ubuntu. https://bugs.launchpad.net/bugs/819443 Title: X fails to start properly when using the open source radeon/ati driver To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/lightdm/+bug/819443/+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