Section "Device"
    Identifier     "Card0"
    Driver         "nvidia"
    Option "AllowGLXWithComposite" "True"  ## add these two lines
    Option "AddARGBGLXVisuals"     "True"
EndSection

###add this section
Section	"Extensions"
    Option	"Composite"	"Enable"
EndSection


Section "Screen"
    Identifier     "Screen0"
    Device         "Card0"
    Monitor        "Monitor0"
    DefaultDepth    24       ## this must be 24