linux user group brescia

salva,
ho reinstallato mandriva 2006, ho una scheda video matrox g400 
dualhead con due monitor, non riesco più a configurare xorg.conf per 
vedere i due monitor, si attiva solo uno: mi potreste dare una mano? 
dove è l'errore?
grazie 
Eugenio

questo è il file xorg.conf:
              
# File generated by XFdrake.

# 
**********************************************************************
# Refer to the XF86Config man page for details about the format of
# this file.
# 
**********************************************************************

Section "Files"
    # Multiple FontPath entries are allowed (they are concatenated 
together)
    # By default, Mandrake 6.0 and later now use a font server 
independent of
    # the X server to render fonts.
    FontPath "unix/:-1"
EndSection

Section "ServerFlags"
    #DontZap # disable <Crtl><Alt><BS> (server abort)
    AllowMouseOpenFail # allows the server to start up even if the 
mouse does not work
    #DontZoom # disable <Crtl><Alt><KP_+>/<KP_-> (resolution 
switching)
    Option "Xinerama" "on"
EndSection

Section "Module"
    Load "dbe" # Double-Buffering Extension
    Load "v4l" # Video for Linux
    Load "extmod"
    Load "type1"
    Load "freetype"
    Load "glx" # 3D layer
    Load "dri" # direct rendering
EndSection

Section "InputDevice"
    Identifier "Keyboard1"
    Driver "keyboard"
    Option "XkbModel" "pc105"
    Option "XkbLayout" "it"
    Option "XkbOptions" "compose:rwin"
EndSection

Section "InputDevice"
    Identifier "Mouse1"
    Driver "mouse"
    Option "Protocol" "ExplorerPS/2"
    Option "Device" "/dev/mouse"
    Option "ZAxisMapping" "6 7"
EndSection

Section "Monitor"
    Identifier "Monitor0"
    VendorName "Plug'n Play"
          
Identifier "Monitor0"
    VendorName "Plug'n Play"
    ModelName "StudioWorks 9 95E"
    HorizSync 30-100
    VertRefresh 50-200

    # TV fullscreen mode or DVD fullscreen output.
    # 768x576 @ 79 Hz, 50 kHz hsync
    ModeLine "768x576"     50.00  768  832  846 1000   576  590  595  
630

    # 768x576 @ 100 Hz, 61.6 kHz hsync
    ModeLine "768x576"     63.07  768  800  960 1024   576  578  590  
616
EndSection

Section "Monitor"
    Identifier "Monitor1"
    VendorName "Plug'n Play"
    ModelName "StudioWorks 9 00B"
    HorizSync 30-100
    VertRefresh 50-200

    # TV fullscreen mode or DVD fullscreen output.
    # 768x576 @ 79 Hz, 50 kHz hsync
    ModeLine "768x576"     50.00  768  832  846 1000   576  590  595  
630

    # 768x576 @ 100 Hz, 61.6 kHz hsync
    ModeLine "768x576"     63.07  768  800  960 1024   576  578  590  
616
EndSection

Section "Device"
    Identifier "Device0"
    VendorName "Matrox"
    BoardName "Matrox Millennium G400 DualHead"
    Driver "mga"
    VideoRam 32768
    Option "DPMS"
    Screen 0
EndSection

Section "Device"
    Identifier "Device1"
    VendorName "Matrox"
    BoardName "Matrox Millennium G400 DualHead"
    Driver "mga"
    VideoRam 32768
    Option "DPMS"
    Screen 1
EndSection

Section "Screen"
    Identifier "Screen0"
    Device "Device0"
    Monitor "Monitor0"
    DefaultColorDepth 24

    Subsection "Display"
        Depth 8
        Virtual 1280 1024
    EndSubsection

    Subsection "Display"
        Depth 15
        Virtual 1280 1024
    EndSubsection

    Subsection "Display"
        Depth 16
        Virtual 1280 1024
    EndSubsection

    Subsection "Display"
        Depth 24
        Virtual 1280 1024
    EndSubsection
EndSection

Section "Screen"
    Identifier "Screen1"
    Device "Device1"
    Monitor "Monitor1"
    DefaultColorDepth 24

    Subsection "Display"
        Depth 8
        Virtual 1280 1024
    EndSubsection

    Subsection "Display"
        Depth 15
        Virtual 1280 1024
    EndSubsection

    Subsection "Display"
        Depth 16
        Virtual 1280 1024
    EndSubsection

Subsection "Display"
        Depth 24
        Virtual 1280 1024
    EndSubsection
EndSection

Section "ServerLayout"
    Identifier "Multihead layout"
    InputDevice "Keyboard1" "CoreKeyboard"
    InputDevice "Mouse1" "CorePointer"
    Screen 0 "Screen0" RightOf "Screen1"
    Screen 1 "Screen1" 0 0
EndSection