problems with dual monitor on fujitsu siemens v5535

[mr.POT]

Hello,
sorry for my english
hoping to write it correctly,
i have read the forum rules, and my problems
regarding dual monitor on my laptop fujitsu v5535 have the sis chipset,
i have installed the PclinuxOs gnome latest release,
all work fine and i give thanks for this to the developers
my only problems is how to have extended desktop on dual monitor,
i'm a newbye in linux system and in this days before writing to the forum
i'have read the xorg doc--and xrandr doc.
But my knowledgment are inadeguate,
actually the video driver work great 1280x800,
but my second screen connected on VGA port show only a cloned desktop.
I have tried to change the xorg.conf--but nothing
tried to run xfdrake but nothing
i post the lspci log , the xrandr -q and the XORG.CONF
no VGA port was detected in xrandr,...i'm hoping some one can help me

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[mark@marklaptop ~]$ lspci
00:00.0 Host bridge: Silicon Integrated Systems [SiS] 671MX
00:01.0 PCI bridge: Silicon Integrated Systems [SiS] SiS AGP Port (virtual PCI-to-PCI bridge)
00:02.0 ISA bridge: Silicon Integrated Systems [SiS] SiS968 [MuTIOL Media IO] (rev 01)
00:02.5 IDE interface: Silicon Integrated Systems [SiS] 5513 [IDE] (rev 01)
00:03.0 USB Controller: Silicon Integrated Systems [SiS] USB 1.1 Controller (rev 0f)
00:03.1 USB Controller: Silicon Integrated Systems [SiS] USB 1.1 Controller (rev 0f)
00:03.3 USB Controller: Silicon Integrated Systems [SiS] USB 2.0 Controller
00:04.0 Ethernet controller: Silicon Integrated Systems [SiS] 191 Gigabit Ethernet Adapter (rev 02)
00:05.0 IDE interface: Silicon Integrated Systems [SiS] SATA Controller / IDE mode (rev 03)
00:06.0 PCI bridge: Silicon Integrated Systems [SiS] PCI-to-PCI bridge
00:07.0 PCI bridge: Silicon Integrated Systems [SiS] PCI-to-PCI bridge
00:0f.0 Audio device: Silicon Integrated Systems [SiS] Azalia Audio Controller
00:1f.0 PCI bridge: Silicon Integrated Systems [SiS] PCI-to-PCI bridge
01:00.0 VGA compatible controller: Silicon Integrated Systems [SiS] 771/671 PCIE VGA Display Adapter (rev 10)
02:00.0 Ethernet controller: Atheros Communications Inc. AR5001 Wireless Network Adapter (rev 01)


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[mark@marklaptop ~]$ xrandr -q
Screen 0: minimum 640 x 480, current 1280 x 800, maximum 2560 x 2048
default connected 1280x800+0+0 0mm x 0mm
   1280x800       60.0*
   1024x768       60.0 
   800x600        60.0 
   640x480        60.0 
   2560x2048      60.0

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# File generated by XFdrake (rev )

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

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

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

Section "Monitor"
    Identifier "monitor1"
    VendorName "Generic"
    ModelName "Flat Panel 1280x800"
    HorizSync 28.8-90
    VertRefresh 60
   
    # Monitor preferred modeline (59.9 Hz vsync, 49.3 kHz hsync, ratio 16/10, 98 dpi)
    ModeLine "1280x800" 71 1280 1328 1360 1440 800 803 809 823 -hsync -vsync
   
    # 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
   
    # modeline generated by gtf(1) [handled by XFdrake]
    ModeLine "1280x800_120"  181.21  1280 1376 1520 1760  800 801 804 858  -HSync +Vsync
   
    # modeline generated by gtf(1) [handled by XFdrake]
    ModeLine "1280x800_100"  147.89  1280 1376 1512 1744  800 801 804 848  -HSync +Vsync
   
    # modeline generated by gtf(1) [handled by XFdrake]
    ModeLine "1280x800_85"  123.38  1280 1368 1504 1728  800 801 804 840  -HSync +Vsync
   
    # modeline generated by gtf(1) [handled by XFdrake]
    ModeLine "1280x800_75"  107.21  1280 1360 1496 1712  800 801 804 835  -HSync +Vsync
   
    # modeline generated by gtf(1) [handled by XFdrake]
    ModeLine "1280x800_60"  83.46  1280 1344 1480 1680  800 801 804 828  -HSync +Vsync
   
    # modeline generated by gtf(1) [handled by XFdrake]
    ModeLine "1280x800_50"  68.56  1280 1336 1472 1664  800 801 804 824  -HSync +Vsync
EndSection

Section "Device"
    Identifier "device1"
    VendorName "Silicon Integrated Systems [SiS]"
    BoardName "SiS SiS 670 / 671-based cards"
    Driver "sisimedia"
    Option "DPMS"
EndSection

Section "Screen"
    Identifier "screen1"
    Device "device1"
    Monitor "monitor1"
    DefaultColorDepth 24
   
    Subsection "Display"
        Depth 8
        Modes "1280x800"
    EndSubsection
   
    Subsection "Display"
        Depth 15
        Modes "1280x800"
    EndSubsection
   
    Subsection "Display"
        Depth 16
        Modes "1280x800"
    EndSubsection
   
    Subsection "Display"
        Depth 24
        Modes "1280x800" "1280x1024"
        Virtual 2560 2048
    EndSubsection
EndSection


Section "ServerLayout"
    Identifier "layout1"
    Screen "screen1"
   
EndSectionBest regards,
Marco