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Hi, do you have 2 outputs on your graphic adapter?
i don't know how to enable the second one but i show you here my XF86Config, which enabled me to use a dual-head display with 2 graphic adapters:
Section "ServerLayout"
Identifier "Multihead layout"
Screen 0 "Screen0" RightOf "Screen1"
Screen 1 "Screen1" 0 0
InputDevice "Mouse0" "CorePointer"
InputDevice "Keyboard0" "CoreKeyboard"
InputDevice "DevInputMice" "AlwaysCore"
Option "Xinerama" "off"
Option "Clone" "off"
EndSection
Section "Monitor"
Identifier "Monitor0"
VendorName "Monitor Vendor"
ModelName "Relisys RE772"
DisplaySize 310 230
HorizSync 30.0 - 74.0
VertRefresh 40.0 - 160.0
Option "dpms"
EndSection
Section "Monitor"
Identifier "Monitor1"
VendorName "Monitor Vendor"
ModelName "IBM G70"
HorizSync 31.0 - 64.0
VertRefresh 50.0 - 105.0
Option "dpms"
EndSection
Section "Device"
# Driver "nv"
Identifier "Videocard0"
Driver "nvidia"
VendorName "Videocard vendor"
BoardName "NVIDIA GeForce 3 (generic)"
EndSection
Section "Device"
# Driver "nv"
Identifier "Videocard1"
Driver "nvidia"
VendorName "Videocard Vendor"
BoardName "NVIDIA GeForce 2 MX (generic)"
BusID "PCI:0:13:0"
EndSection
Section "Screen"
Identifier "Screen0"
Device "Videocard0"
Monitor "Monitor0"
DefaultDepth 24
SubSection "Display"
Depth 24
Modes "1280x960" "1152x864" "1024x768" "800x600" "640x480"
EndSubSection
EndSection
Section "Screen"
Identifier "Screen1"
Device "Videocard1"
Monitor "Monitor1"
DefaultDepth 24
SubSection "Display"
Depth 24
Modes "1280x960"
EndSubSection
EndSection
i hope it helps a little!
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