I can confirm this trouble. It happen since the 31/01 to me. I tried the package from stock repository and xorg-edgers PPA but I've got the same trouble.
It seams to happen quicker when launching virt-manager and firefox and reducing/restoring these windows. I attach the backtrace of the latest crash ** Attachment added: "Xorg.0.log.old" https://bugs.launchpad.net/ubuntu/+source/xorg/+bug/711434/+attachment/1824528/+files/Xorg.0.log.old -- 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/711434 Title: [natty] frequent Xorg freezes with nouveau _______________________________________________ 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
