I'm a little hesitant to say this is fixed until I get more running time, but since the framebuffer and linux-firmware packages were updated I switched X back to using the radeon driver, ran for a while with no lock ups, took the 'nomodeset' option out of the boot up and am currently running Gnome with Mutter as the window manager.
I do get an error about an invalid frame buffer ID now. ** Attachment added: "dmesg.txt" http://launchpadlibrarian.net/49840345/dmesg.txt -- Xorg freeze drm radeon 'Faild to schedule IB' https://bugs.launchpad.net/bugs/588940 You received this bug notification because you are a member of Ubuntu-X, which is subscribed to xserver-xorg-video-ati in ubuntu. _______________________________________________ Mailing list: https://launchpad.net/~ubuntu-x-swat Post to : [email protected] Unsubscribe : https://launchpad.net/~ubuntu-x-swat More help : https://help.launchpad.net/ListHelp

