Given the output, I'm suspecting the kernel DRM driver. Since it sounds like it was a recent regression, try booting earlier kernels (-18 or -19) and see if the issue goes away. If so, then this sounds like perhaps a kernel regression.
Otherwise, please attach a photo showing the garbage on the screen. ** Changed in: xserver-xorg-video-ati (Ubuntu) Status: Confirmed => Incomplete -- Radeon 4550: [drm:radeon_fence_wait] *ERROR* fence https://bugs.launchpad.net/bugs/565323 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 : ubuntu-x-swat@lists.launchpad.net Unsubscribe : https://launchpad.net/~ubuntu-x-swat More help : https://help.launchpad.net/ListHelp