Section "ServerLayout"
    Identifier  "Layout0"
    Option      "AutoAddDevices" "false"
    Option      "AutoAddGPU" "false"
EndSection
Section "Device"
    Identifier  "DiscreteNvidia"
    Driver      "nouveau"

#   If the X server does not automatically detect your VGA device,
#   you can manually set it here.
#   To get the BusID prop, run `lspci | egrep 'VGA|3D'` and input the data
#   as you see in the commented example.
#   This Setting is needed on Ubuntu 13.04.
    BusID "PCI:01:00:0"

EndSection