A sample xorg.conf file is given for Geode device , pl remove syntax errors if any : 
Section "Monitor"
 Identifier  "ACER-VGA"  
DisplaySize  215 215
HorizSync   24.0-80.0 
 VertRefresh  56.0-90.0
EndSection
Section "Monitor"
Identifier  "lap-LVDS"
HorizSync   31.5-50
 VertRefresh 40.0-60.0
EndSection
Section "Device"
Identifier "Geode Device"
Driver      "geode"
Option      "DRI" "true"  
#Option "MonitorLayout"  "CRT,LFP" 
#Option "Clone"  "true" 
#Option "CloneRefresh" 60
BusID "PCI:0:02:0"
Screen0
#VideoRam    4096
# Insert Clocks lines here if appropriate
EndSection
Section "Screen" 
Identifier "Screen" 
Device     "Geode Device (Rev 2) "
Monitor     "ACER-VGA" 
DefaultDepth 16 
Subsection "Display" 
Depth       16 
Modes 1440x900 1280x768 1024x768 800x600 640x480 Virtual 1440 1440 
#ViewPort    0 0 
EndSubsection 
EndSection 
Section "Screen" 
Identifier  "Screen 1" 
Device      "Geode"
Monitor    " lap-LVDS" 
DefaultDepth 16 
Subsection "Display" 
Depth       16
Modes 1280x768 1024x768& 800x600 640x480 #Virtual 1440 1440 #ViewPort    0 0 
EndSubsection 
EndSection 
# ********************************************************************** 
# ServerLayout sections. 
# ********************************************************************** 
Section "ServerLayout"  
Option "AIGLX"  "false" 
# The Identifier line must be present 
Identifier  "Dual Layout"
 
# Each Screen line specifies a Screen section name, and optionally 
# the relative position of other screens.  The four names after 
# primary screen name are the screens to the top, bottom, left and right 
# of the primary screen.  In this example, screen 2 is located to the 
# right of screen 1. 
Screen "Screen 0" 
Screen "Screen 1" "RightOf "Screen 0"
InputDevice "Mouse"  "CorePointer" 
InputDevice "Keyboard1" "CoreKeyboard" 
EndSection 
Section "DRI" 
Group "video" 
Mode    0660 
EndSection