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 Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/711434 Title: [natty] frequent Xorg freezes with nouveau -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
