xorg.conf

Section "ServerLayout"
	Identifier     "X.org Configured"
	Screen      0  "Screen0" 0 0
	Screen      1  "Screen1" RightOf "Screen0"
EndSection

Section "Device"
	Identifier  "Card0"
	Driver      "radeon"
	Option      "ZaphodHeads" "LVDS"
#	Option      "ZaphodHeads" "VGA-0"
	BusID       "PCI:0:1:0"
EndSection

Section "Device"
	Identifier  "Card1"
	Driver      "radeon"
	Option      "ZaphodHeads" "VGA-0"
	BusID       "PCI:1:0:0"
EndSection

Section "Screen"
	Identifier "Screen0"
	Device     "Card0"
EndSection

Section "Screen"
	Identifier "Screen1"
	Device     "Card0"
EndSection