https://bugs.freedesktop.org/show_bug.cgi?id=94933
--- Comment #6 from Nicola Mori nicolamori@aol.com --- Changing the desktop size screws the screen but the system is still responsive. I can go back to a fully working situation with
xrandr --fb 1280x800
I attach the relevant parts of dmesg and Xorg.0.log.