I have a Dell Inspiron 4000, recently converted to debian.
I can't seem to get the external monitor to work as an extended desktop (although using Fn + F8 allows me to mirror the display to my external monitor).

Has anyone had success with this? I have not been able to find any details elsewhere. Any suggestions or recommendations for the XF86Config-4 file
are appreciated.

video card is ATI Technologies Inc Rage Mobility M3 AGP 2x (rev 02).

The error I get is "Fatal Server Error: Requested Entity already in use!"

Thanks!

Some additional info - here is the XF86Config file I am trying (but doesnt work). Maybe someone can point out something I did wrong, but didn't notice:

# XF86Config-4 (XFree86 X Window System server configuration file)
Section "ServerLayout"
Identifier "Default Layout"
Screen 0 "Default Screen" 0 0
Screen 1 "Ext Screen" Rightof "Default Screen"
InputDevice "Generic Keyboard"
InputDevice "Configured Mouse"
EndSection

Section "Files"
# local font server
# if the local font server has problems, we can fall back on these
FontPath "unix/:7100"
FontPath "/usr/lib/X11/fonts/misc"
FontPath "/usr/lib/X11/fonts/cyrillic"
FontPath "/usr/lib/X11/fonts/100dpi/:unscaled"
FontPath "/usr/lib/X11/fonts/75dpi/:unscaled"
FontPath "/usr/lib/X11/fonts/Type1"
FontPath "/usr/lib/X11/fonts/CID"
FontPath "/usr/lib/X11/fonts/Speedo"
FontPath "/usr/lib/X11/fonts/100dpi"
FontPath "/usr/lib/X11/fonts/75dpi"
EndSection

Section "Module"
Load "GLcore"
Load "bitmap"
Load "dbe"
Load "ddc"
Load "dri"
Load "extmod"
Load "freetype"
Load "glx"
Load "int10"
Load "record"
Load "speedo"
Load "type1"
Load "vbe"
EndSection

Section "ServerFlags"
Option "Xinerama" "On"
EndSection

Section "InputDevice"
Identifier "Generic Keyboard"
Driver "keyboard"
Option "CoreKeyboard"
Option "XkbRules" "xfree86"
Option "XkbModel" "pc104"
Option "XkbLayout" "us"
EndSection

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

Section "Monitor"
Identifier "DXS:1313"
HorizSync 31.5 - 79.0
VertRefresh 43.0 - 72.0
Option "DPMS"
Option "DDC" "Off"
EndSection

Section "Monitor"
Identifier "LCD"
HorizSync 31.5 - 79.0
VertRefresh 43.0 - 72.0
Option "DPMS"
EndSection

Section "Device"
Identifier "ATI Technologies, Inc. Rage Mobility M3 AGP 2x"
Driver "r128"
# Driver "ati"
BusID "PCI:1:0:0"
Screen 0
EndSection

Section "Device"
Identifier "Ext"
Driver "r128"
# Driver "ati"
BusID "PCI:1:0:0"
Screen 1
EndSection

Section "Screen"
Identifier "Default Screen"
Device "ATI Technologies, Inc. Rage Mobility M3 AGP 2x"
Monitor "DXS:1313"
DefaultDepth 24
SubSection "Display"
Depth 1
Modes "1024x768" "800x600" "640x480"
EndSubSection
SubSection "Display"
Depth 4
Modes "1024x768" "800x600" "640x480"
EndSubSection
SubSection "Display"
Depth 8
Modes "1024x768" "800x600" "640x480"
EndSubSection
SubSection "Display"
Depth 15
Modes "1024x768" "800x600" "640x480"
EndSubSection
SubSection "Display"
Depth 16
Modes "1024x768" "800x600" "640x480"
EndSubSection
SubSection "Display"
Depth 24
Modes "1024x768" "800x600" "640x480"
EndSubSection
EndSection

Section "Screen"
Identifier "Ext Screen"
Device "Ext"
Monitor "LCD"
DefaultDepth 24
SubSection "Display"
Depth 1
Modes "1024x768" "800x600" "640x480"
EndSubSection
SubSection "Display"
Depth 4
Modes "1024x768" "800x600" "640x480"
EndSubSection
SubSection "Display"
Depth 8
Modes "1024x768" "800x600" "640x480"
EndSubSection
SubSection "Display"
Depth 15
Modes "1024x768" "800x600" "640x480"
EndSubSection
SubSection "Display"
Depth 16
Modes "1024x768" "800x600" "640x480"
EndSubSection
SubSection "Display"
Depth 24
Modes "1280x1024" "1024x768" "800x600" "640x480"
EndSubSection
EndSection

Section "DRI"
Mode 0666
EndSection