xorg option to switch GPU

[logangt]

Hye @ all,

i own a dell xps 13 since january of this year. This laptop has hybrid sli
which is not supported in linux.
I want to know if it's possible to configure xorg to use only the onboard
GPU and switch the powerful one off?
In vista i reach more than 4h batterylife in study modus (have some PDF open
and hear music) by the same activity, in linux a reach only 2h.
I have tried with "BusId 'PCI:2:00:0'" but it does't work! (i toke the
2:00:0 from "lspci" output
PS sorry for my English

here is my xorg.conf
# nvidia-xconfig: X configuration file generated by nvidia-xconfig
# nvidia-xconfig:  version 1.0  (buildmeister at builder62)  Mon May 11
15:57:20 PDT 2009


Section "ServerLayout"
    Identifier     "Layout0"
    Screen      0  "Screen0" 0 0
    InputDevice    "Keyboard0" "CoreKeyboard"
    InputDevice    "Synaptics Touchpad" "CorePointer"
EndSection

Section "Files"
EndSection

Section "Module"
    Load           "dbe"
    Load           "extmod"
    Load           "type1"
    Load           "freetype"
    Load           "glx"
EndSection

Section "InputDevice"
    # generated from default
    Identifier     "Synaptics Touchpad"
    Driver         "synaptics"
    Option         "Protocol" "auto-dev"
    Option         "Device" "/dev/psaux"
    Option         "Emulate3Buttons" "no"
    Option         "ZAxisMapping" "4 5"
    Option         "SHMConfig" "on"
    Option         "VertTwoFingerScroll"   "true"
    Option         "HorizTwoFingerScroll"  "true"
EndSection

Section "InputDevice"

    # generated from default
    Identifier     "Keyboard0"
    Driver         "kbd"
EndSection

Section "Monitor"
    Identifier     "Monitor0"
    VendorName     "Unknown"
    ModelName      "Unknown"
    HorizSync       28.0 - 33.0
    VertRefresh     43.0 - 72.0
    Option         "DPMS"
EndSection

Section "Device"
    Identifier     "Device0"
    Driver         "nvidia"
    VendorName     "NVIDIA Corporation"
    BoardName 	   "GeForce 9400M G"
EndSection

Section "Screen"
    Identifier     "Screen0"
    Device         "Device0"
    Monitor        "Monitor0"
    DefaultDepth    24
    Option         "NoLogo" "True"
    SubSection     "Display"
        Depth       24
    EndSubSection
EndSection

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