Can you please attach your /etc/X11/xorg.conf and try moving it out of the way so it is not used and then reboot? sudo mv /etc/X11/xorg.conf{,.bak} will do it.
Can you please attach your /etc/X11/xorg.conf and try moving it out of the way so it is not used and then reboot? sudo mv /etc/X11/ xorg.conf{ ,.bak} will do it.