If you can still reproduce the crash, give this patch a try. It skips damaging the pixmap on rotation if there's no drawable. So, possibly this could result in less pretty rotation animations but only in situations where X would otherwise be crashing.
** Patch added: "nullptr_xf86rotateprepare.patch" https://bugs.launchpad.net/ubuntu/+source/xorg-server/+bug/1155136/+attachment/3653554/+files/nullptr_xf86rotateprepare.patch -- 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/1155136 Title: X Server crashes after pressing [Super] + [P] in DamageRegister() To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/xorg-server/+bug/1155136/+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