Further testing suggests that the error is only triggered by moving the mouse out of the first screen. Also it isn't possible to move it back to the first screen: the cursor flickers and is briefly displayed back on the main display then it is flickering again on the adjacent one. Afterwards, pressing a key on the keyboard seems to shutdown X.
** Attachment added: "X.org log containing backtrace" http://launchpadlibrarian.net/46551945/Xorg.0.log.old -- X server crashes when enabling Xinerama (multiple GFX adapters) https://bugs.launchpad.net/bugs/572192 You received this bug notification because you are a member of Ubuntu-X, which is subscribed to libxinerama in ubuntu. _______________________________________________ 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