xorg option to switch GPU

logangt jackywolfskin at gmail.com
Sun Aug 16 03:22:22 PDT 2009

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"

Section "Files"

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

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"

Section "InputDevice"

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

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

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

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

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