Similar hardware (ibook G4 1Ghz Radeon Mobility 9200) and similar problem: external VGA monitor is not working. I tried with "clone" attributes in XF86config (attached), with poor results :-(
The attached XF86config works OK with just the LCD. By uncommenting lines in section ServerLayout you obtain the best result I have... which is useless. Any idea welcome
# XF86Config-4 (XFree86 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 XF86Config-4 manual page.
# (Type "man XF86Config-4" at the shell prompt.)
#
# This file is automatically updated on xserver-xfree86 package upgrades *only*
# if it has not been modified since the last upgrade of the xserver-xfree86
# package.
#
# If you have edited this file but would like it to be automatically updated
# again, run the following commands as root:
#
# cp /etc/X11/XF86Config-4 /etc/X11/XF86Config-4.custom
# md5sum /etc/X11/XF86Config-4 > /var/lib/xfree86/XF86Config-4.md5sum
# dpkg-reconfigure xserver-xfree86
Section "Files"
# The location of the RGB database. Note, this is the name of the
# file minus the extension (like ".txt" or ".db"). There is normally
# no need to change the default.
RgbPath "/usr/lib/X11/rgb"
FontPath "unix/:7100" # local font server
# if the local font server has problems, we can fall back on these
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"
# FontPath "/usr/share/fonts/default/TrueType"
# FontPath "/usr/share/fonts/default/Type1"
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 "InputDevice"
Identifier "Generic Keyboard"
Driver "keyboard"
Option "CoreKeyboard"
Option "XkbRules" "xfree86"
Option "XkbModel" "pc"
Option "XkbLayout" "it-new"
# Option "XkbVariant" "nodeadkeys"
EndSection
Section "InputDevice"
Identifier "Configured Mouse"
Driver "mouse"
Option "CorePointer"
Option "Device" "/dev/input/mice"
Option "Protocol" "ImPS/2"
Option "ZAxisMapping" "4 5"
EndSection
Section "InputDevice"
Identifier "Generic Mouse"
Driver "mouse"
Option "SendCoreEvents" "true"
Option "Device" "/dev/input/mice"
Option "Protocol" "ImPS/2"
Option "Emulate3Buttons" "true"
Option "ZAxisMapping" "4 5"
EndSection
Section "Device"
Identifier "iBook Video Card"
Option "UseFBDev" "true"
Driver "radeon"
VendorName "ATI"
Option "AGPSize" "16"
Option "AGPMode" "4"
BusID "PCI:00:16:00"
# Option "NoAccel" "true"
# Option "EnablePageFlip"
# aggiunte
# Option "CloneMode" "1024x768"
# Option "MonitorLayout" "LVDS, CRT"
Screen 0
EndSection
Section "Monitor"
Identifier "Generic Monitor"
DisplaySize 323 216
Gamma 0.75
Option "DPMS"
EndSection
Section "Screen"
Identifier "BuiltIn Screen"
Device "iBook Video Card"
Monitor "Generic Monitor"
DefaultDepth 24
SubSection "Display"
Depth 1
Modes "1024x768"
EndSubSection
SubSection "Display"
Depth 4
Modes "1024x768"
EndSubSection
SubSection "Display"
Depth 8
Modes "1024x768"
EndSubSection
SubSection "Display"
Depth 15
Modes "1024x768"
EndSubSection
SubSection "Display"
Depth 16
Modes "1024x768"
EndSubSection
SubSection "Display"
Depth 24
Modes "1024x768"
EndSubSection
EndSection
###############################
#
# DA QUI COMINCIA LA CONFIGURAZIONE PER L'USCITA VGA
#
###############################
Section "Device"
Identifier "iBook Video Card Esterna"
Driver "radeon"
Option "AGPMode" "4"
Option "UseFBDev" "true"
VendorName "ATI"
BusID "PCI:00:16:00"
# Option "NoAccel" "true"
# Option "AGPSize" "16"
# Option "EnablePageFlip"
# aggiunte
# Option "CloneMode" "1024x768"
# Option "MonitorLayout" "LVDS,CRT"
Screen 1
EndSection
Section "Monitor"
Identifier "Monitor Esterno"
# HorizSync 30-50
# VertRefresh 60
Option "DPMS"
EndSection
Section "Screen"
Identifier "External Screen"
Device "iBook Video Card Esterna"
Monitor "Monitor Esterno"
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 "ServerLayout"
Identifier "Default Layout"
# Commentare per eliminare l'uscita VGA esterna
# Option "Clone" "1"
Screen "BuiltIn Screen"
# Screen "External Screen"
InputDevice "Generic Keyboard"
InputDevice "Configured Mouse"
EndSection
Section "DRI"
Mode 0666
EndSection
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