dual head config problem

[pkaplan1 at comcast.net]

I'm running Gutsy on a Thinkpad T43 (intel 915 video card and 1024x768 panel) and a Sony X-95 external monitor (1280x1024) with the xorg.conf file shown at the end of this message.

When X first starts, a 1280x1024 desktop appears on the external monitor and a mirrored 1024x768 desktop appears both on the internal monitor and placed on top and at the upper right of the external monitor.  The output of xrandr is:

--------------------------
   $ xrandr
   Screen 0: minimum 320 x 200, current 1280 x 1024, maximum 2304 x 1024
   VGA connected 1280x1024+0+0 (normal left inverted right) 376mm x 301mm
      1280x1024      60.0*+   75.0     59.9
      1280x960       59.9
      1024x768       75.1     70.1     60.0
      800x600        72.2     75.0     60.3
      640x480        75.0     72.8     60.0
      720x400        70.1
   LVDS connected 1024x768+0+0 (normal left inverted right) 0mm x 0mm
      1024x768       57.6*+   85.0     75.0     70.1     60.0
      832x624        74.6
      800x600        85.1     72.2     75.0     60.3     56.2
      640x480        85.0     72.8     75.0     59.9
      720x400        85.0
      640x400        85.1
      640x350        85.1
   TV disconnected (normal left inverted right)
   $  
----------------------------------

Even though I have the line:

Option		"LeftOf" "Monitor-LVDS"

in the monitor stanza for the external monitor (see below), I have to manually execute:

xrandr --output VGA --left-of LVDS

to get a full 2304x1024 virtual desktop with the external monitor to the left of the internal monitor.

How can I hard code this into the xorg.conf file so I don't have to execute everytime I boot the machine with the external monitor?

TIA
Paul

xorg.conf:
--------------------------------------
Section "Files"
EndSection

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

Section "InputDevice"
	Identifier	"Configured Mouse"
	Driver		"mouse"
	Option		"CorePointer"
	Option		"Device"		"/dev/input/mice"
	Option		"Protocol"		"ImPS/2"
	Option		"ZAxisMapping"		"4 5"
	Option		"Emulate3Buttons"	"true"
EndSection

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

Section "Device"
	Identifier	"Intel Corporation Mobile 915GM/GMS/910GML Express Graphics Controller"
	Driver		"intel"
	Option		"Monitor-LVDS"
	Option		"Monitor-VGA"
EndSection

Section "Monitor"
	Identifier	"Monitor-LVDS"
EndSection

Section "Monitor"
	Identifier	"Monitor-VGA"
	Option		"LeftOf" "Monitor-LVDS"
EndSection

Section "Screen"
	Identifier	"Default Screen"
	Device		"Intel Corporation Mobile 915GM/GMS/910GML Express Graphics Controller"
	Monitor		"Monitor-LVDS"
	DefaultDepth	24
	SubSection "Display"
		Depth 24
		Virtual 2304 1024
	EndSubSection
EndSection

Section "ServerLayout"
	Identifier	"Default Layout"
	Screen		"Default Screen"
	InputDevice	"Generic Keyboard"
	InputDevice	"Configured Mouse"
EndSection
--------------------------------------