ノートPCでubuntu8.04を使っているのですが外部ディスプレイの表示ができません。いろいろ検索して試してはみたのですが・・・
どうすればいいのでしょうか？？

# xorg.conf (X.Org 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 "InputDevice"
    Identifier    "Generic Keyboard"
    Driver        "kbd"
    Option        "XkbRules"    "xorg"
    Option        "XkbModel"    "jp106"
    Option        "XkbLayout"    "jp,jp"
    Option        "XkbOptions"    "grp:alt_shift_toggle,grp_led:scroll"
    Option        "XkbVariant"    "106,"
EndSection

Section "InputDevice"
    Identifier    "Configured Mouse"
    Driver        "mouse"
    Option        "CorePointer"
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    "Configured Video Device"
EndSection

Section "Monitor"
    Identifier    "Configured Monitor"
EndSection

Section "Screen"
    Identifier "Default Screen"
    Monitor    "Configured Monitor"
    Device     "Configured Video Device"
    SubSection "Display"
        Virtual    2624 1200
    EndSubSection
EndSection

Section "ServerLayout"
    Identifier    "Default Layout"
    Screen        "Default Screen"
    InputDevice    "Synaptics Touchpad"
EndSection

xrandr:
Screen 0: minimum 320 x 200, current 1280 x 768, maximum 2624 x 1200
VGA connected (normal left inverted right x axis y axis)
   1680x1050      59.9 +   60.0 
   1280x1024      75.0     59.9 
   1440x900       59.9 
   1024x768       75.1     70.1     60.0 
   832x624        74.6 
   800x600        72.2     75.0     60.3     56.2 
   640x480        75.0     72.8     66.7     60.0 
   720x400        70.1 
LVDS connected 1280x768+0+0 (normal left inverted right x axis y axis) 0mm x 0mm
   1280x800       57.6 +   60.0 
   1280x768       60.0*
   1152x768       54.8 
   1024x768       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 
TMDS-1 disconnected (normal left inverted right x axis y axis)
TV disconnected (normal left inverted right x axis y axis)
ほかに必要な情報があれば教えてください。