In X11 make this section 
Section "Device"
    Identifier  "VESA"
    Driver      "nvidia" # do not remove vesa
    Option "RenderAccel" "on"
    Option "XAANoOffscreenPixmaps"
    #Option "BusType" "PCI"
    #Option "ColorTiling" "on"
    #Option "EnablePageFlip" "on"
EndSection


Look like this... ONLY CHANG ETHE DRIVER , don't dick with anything else that may be in your xorg.conf
Section "Device"
    Identifier  "VESA"
    Driver      "vesa" # do not remove vesa
    Option "RenderAccel" "on"
    Option "XAANoOffscreenPixmaps"
    #Option "BusType" "PCI"
    #Option "ColorTiling" "on"
    #Option "EnablePageFlip" "on"
EndSection