cat /etc/X11/xorg.conf | grep Driver | grep "\"nv\"" 1> /dev/null
if [ $? = 0 ]; then
 sed s'/nvidia/vesa/'g /etc/X11/xorg.conf > /etc/X11/xorg.conf.new
 mv /etc/X11/xorg.conf.new /etc/X11/xorg.conf
fi