This is about to drive me up the wall. After an update last week my Ubuntu 12.10 machine has a scrolling screen when I switch it to 1920x1080 (16:9). I can't seem to find anyone who has the same problem. Does anyone have an idea what is going on?
You could try installing an updated version of X11 using either the xorg-updates, or the bleeding edge xorg-edgers PPAs:
If those end up breaking your X11, the ppa-purge tool can be used to revert back to the normal repository.