Multiseat xorg_seat1.conf

Section "Device"
        Identifier "htpc"
        Driver "nvidia"
        BusID       "PCI:6:0:0"
EndSection

Section "InputClass"
    Identifier "ignore_other_seats"
    Option "Ignore" "yes"
EndSection

Section "InputClass"
    Identifier "input_htpc"
    MatchTag "input_htpc"
    Option "Ignore" "no"
EndSection

Section "ServerFlags"
        Option "AutoAddGPU" "FALSE"
EndSection