haci debe quedar viejo:

Section "Device"
	Identifier      "Nvidia Geforce 4 420"
	Driver          "nvidia"
	BusID           "AGP:01:00:0"
	Option          "NoDDC" "1"
	Option          "IgnoreEDID" "1"
	# Importante si se usa una pantalla TFT
	Option          "GenerateRTList"   "0"
	Option          "OverridePolarity" "1"
	# Switch AGP
	Option		"NvAGP" "3"
	# Imágen mejorada
	Option		"DigitalVibrance" "0"
	# TV Twinview
	Option		"TwinView" "1"
	Option		"SecondMonitorHorizSync" "30-50"
	Option		"SecondMonitorVertRefresh" "60"
	Option		"TwinViewOrientation" "Clone"
	Option		"TVOutFormat" "SVIDEO"
	Option		"ConnectedMonitor" "DFP,TV"
	Option		"TVStandard" "PAL-B"
	Option		 "MetaModes" "1024x768 @1024x768,1024x768 @1024x768; 800x600
@800x600,800x600 @800x600; 640x480 @640x480,640x480 @640x480"
EndSection

#esta solo copiala y pegala 
#seccion para tv
Section "Screen"
	Identifier		"TV"
	Device		"Nvidia Geforce 4 420"
	Monitor		"Generic Monitor"
	DefaultDepth	 24
	SubSection "Display"
	Depth	 24
	EndSubSection
EndSection


#lo mismo que la anterior
Section "ServerLayout"
	Identifier			"Twinview"
	Screen			"TV"
	InputDevice	"Keyboard0" "CoreKeyboard"
	InputDevice	"PS/2 Mouse" "CorePointer"
	 InputDevice	"USB Mouse" "CorePointer"
EndSection