Getting S-Video out working with X on an 8800GS

Audio Phile da_audiophile at
Wed Dec 2 01:00:36 PST 2009

I have an 8400GS that has an S-Video out and I want to run it connected to a SDTV only (not to a CRT and TV). When I connect the card to my TV via an S-video cable without connecting the monitor at all, I can watch Linux boot on the TV. Problem for me is when I start X. The TV goes blank. If I plug in a CRT monitor, X is being displayed there rather than on the TV. If I have the TV connected and I also connect a CRT monitor, I can get into X just fine. The nvidia-settings program doesn't detect my TV at all.

I should say that if I switch out the 8400GS (PCI) for an older 6200 (AGP) everything just works without any modifications to the /etc/X11/xorg.conf at all!  I've tried adding many of the suggested lines at the following wiki page, but still, no output to X:

Here is the /etc/X11/xorg.conf that works with the 6200 (AGP) but not with the 8400GS (PCI):

Section "ServerLayout"
    Identifier     "Layout0"
    Screen      0  "Screen0" 0 0
    InputDevice    "Keyboard0" "CoreKeyboard"
    InputDevice    "Mouse0" "CorePointer"

Section "Files"

Section "InputDevice"
    Identifier     "Mouse0"
    Driver         "mouse"
    Option         "Protocol" "auto"
    Option         "Device" "/dev/psaux"
    Option         "Emulate3Buttons" "no"
    Option         "ZAxisMapping" "4 5"

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"

Section "Screen"
    Identifier     "Screen0"
    Device         "Device0"
    Monitor        "Monitor0"
    DefaultDepth    24
    SubSection     "Display"
        Depth       24
        Modes "800x600"


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