Thanks for your bug report. I believe xorg is the correct package to report this against, as it involves the user being thrown back to the login screen (https://wiki.ubuntu.com/Bugs/FindRightPackage#Graphical_Environment), but the fact that the problem doesn't occur in an Ubuntu-2d session would seem to suggest Compiz may be at fault. I'm going to file this against xorg for now, though, per the wiki page. Please run the following command in a terminal in order to get additional information relevant to your system attached to this report: apport-collect 888872
** Package changed: compiz-plugins-main (Ubuntu) => xorg (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/888872 Title: Unity 3D desktop crashes in Oneiric using ATI Mbility Radeon X1600 To manage notifications about this bug go to: https://bugs.launchpad.net/compiz/+bug/888872/+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