File di configurazione generico di xorg.conf  che funziona con una debian  5.0

  www.linuxatwork.biz/joomla1/files/xorg_conf.txt

# /etc/X11/xorg.conf (xorg 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 /etc/X11/xorg.conf manual page.
# (Type "man /etc/X11/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        "CoreKeyboard"
    Option        "XkbRules"    "xorg"
    Option        "XkbModel"    "pc105"
    Option        "XkbLayout"    "it"
EndSection

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

Section "Device"
    Identifier    "ATI Technologies Inc RV370 5B60 [Radeon X300 (PCIE)]"
    Driver        "vesa"
#    BusID        "PCI:1:0:0"
EndSection

Section "Monitor"
    Identifier    "Monitor Generico"
    Option        "DPMS"
    HorizSync    28-51
    VertRefresh    43-60
EndSection

Section "Screen"
    Identifier    "Default Screen"
#    Device        "ATI Technologies Inc RV370 5B60 [Radeon X300 (PCIE)]"
    Monitor        "Monitor Generico"
    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"
    Screen        "Default Screen"
    InputDevice    "Generic Keyboard"
    InputDevice    "Configured Mouse"
EndSection