Section "ServerLayout"
    Identifier "layout"
    Screen 0 "nouveau"
    Inactive "intel"
EndSection

Section "Device"
    Identifier  "nouveau"
    Driver      "nouveau"
    BusID       "PCI:x:x:x" # Sample: "PCI:1:0:0"
EndSection

Section "Screen"
    Identifier "nouveau"
    Device "nouveau"
EndSection

Section "Device"
    Identifier  "intel"
    Driver      "intel"
    BusID       "PCI:x:x:x"  # Sample: "PCI:0:2:0"
EndSection

Section "Screen"
    Identifier "intel"
    Device "intel"
EndSection