Stangely, the exact same symptoms have been happening for me after the upgrade from 12.04 to 13.04. Once in a while the same thing: new Firefox tab, loads for a second, and Gnome/X freezes. Mouse cursor moves, and processes seem to keep running.
I can still SSH into the box. Killing processes doesn't seem to bring down X and I have to reboot.
Almost nothing in our setup is the same: amd64, AMD video, 13.04, Firefox 22, kernel 3.8.0.
Stangely, the exact same symptoms have been happening for me after the upgrade from 12.04 to 13.04. Once in a while the same thing: new Firefox tab, loads for a second, and Gnome/X freezes. Mouse cursor moves, and processes seem to keep running.
I can still SSH into the box. Killing processes doesn't seem to bring down X and I have to reboot.
Almost nothing in our setup is the same: amd64, AMD video, 13.04, Firefox 22, kernel 3.8.0.