Mine

# xorg.conf (xorg X Window System server configuration file)
#
# This file was generated by dexconf, the Debian X Configuration tool, using
# values from the debconf database.
#
# Edit this file with caution, and see the xorg.conf manual page.
# (Type "man xorg.conf" at the shell prompt.)
#
# This file is automatically updated on xserver-xorg package upgrades *only*
# if it has not been modified since the last upgrade of the xserver-xorg
# package.
#
# If you have edited this file but would like it to be automatically updated
# again, run the following command:
#   sudo dpkg-reconfigure -phigh xserver-xorg

Section "Files"
EndSection

Section "InputDevice"
	Identifier	"Generic Keyboard"
	Driver		"kbd"
	Option		"CoreKeyboard"
	Option		"XkbRules"	"xorg"
	Option		"XkbModel"	"pc105"
	Option		"XkbLayout"	"de"
	Option		"XkbVariant"	"nodeadkeys"
EndSection

Section "InputDevice"
	Identifier	"Configured Mouse"
	Driver		"mouse"
	Option		"CorePointer"
	Option		"Device"		"/dev/input/mice"
	Option		"Protocol"		"ImPS/2"
	Option		"Emulate3Buttons"	"true"
EndSection

Section "InputDevice"
	Identifier	"Synaptics Touchpad"
	Driver		"synaptics"
	Option		"SendCoreEvents"	"true"
	Option		"Device"		"/dev/psaux"
	Option		"Protocol"		"auto-dev"
	Option		"HorizScrollDelta"	"0"
EndSection

Section "Device"
	Identifier	"VIA Technologies, Inc. S3 Unichrome Pro VGA Adapter"
	Driver		"via"
	BusID		"PCI:1:0:0"
EndSection

Section "Monitor"
	Identifier	"Generic Monitor"
#Option		"DPMS"
	HorizSync	28-49
	VertRefresh	43-72
EndSection

Section "Screen"
	Identifier	"Default Screen"
	Device		"VIA Technologies, Inc. S3 Unichrome Pro VGA Adapter"
	Monitor		"Generic Monitor"
	DefaultDepth	24
	SubSection "Display"
		Modes		"1024x768" "800x600" "640x480"
	EndSubSection
EndSection

Section "Monitor"
	Identifier  "Ext Monitor"
	HorizSync    31.5-81.0
	VertRefresh  56.0-75.0
#Option "DPMS"
EndSection
Section "Screen"
	Identifier      "External Screen"
	Device          "VIA Technologies, Inc. S3 Unichrome Pro VGA Adapter"
	Monitor         "Ext Monitor"
	DefaultDepth    24
	SubSection "Display"
		Modes           "1024x768" "800x600" "640x480"
	EndSubSection
EndSection
								
#Section "ServerLayout"
#	Identifier	"Default Layout"
#	Screen		"Default Screen"
#	InputDevice	"Generic Keyboard"
#	InputDevice	"Configured Mouse"
##	InputDevice	"Synaptics Touchpad"
#EndSection
Section "ServerLayout"
	Identifier     "Dual Screen"
   	Screen      0  "Default Screen" 0 0
  	Screen      1  "External Screen" RightOf "Default Screen"
	InputDevice	"Generic Keyboard"
	InputDevice	"Configured Mouse"
EndSection
Section "ServerFlags"
	Option "Xinerama" "true"
EndSection