pour faire du bi ecran il faut deux section Device, deux section Screen et deux section Monitor, et il faut relier les deux section Screen dans ServerLayout
le truc c'est qu'il y a plusieurs moyens de faire du multiecran sous linux ... je conseille xinerama
nvidia-settings c'est bien mais la dernière fois que je l'ai utilisé il m'a completement réécrit le xorg.conf avec un clavier ricain ...
voila les parties interresantes de mon xorg.conf, à adapter :
Section "ServerLayout"
Identifier "Main"
Screen 0 "CRT (with TFT) Screen" 1280 0
Screen 1 "TFT(with CRT) Screen" LeftOf "CRT (with TFT) Screen"
InputDevice "Default Keyboard" "CoreKeyboard"
InputDevice "Meta Mouse" "CorePointer"
Option "Xinerama" "On"
# Option "AIGLX" "true"
EndSection
Section "Monitor"
# HorizSync source: edid, VertRefresh source: edid
Identifier "CRT Monitor"
VendorName "Mitsubishi"
ModelName "Diamond Pro"
HorizSync 31.0 - 96.0
VertRefresh 55.0 - 160.0
Option "DPMS"
EndSection
Section "Monitor"
# HorizSync source: edid, VertRefresh source: edid
Identifier "TFT Monitor"
VendorName "Samsung"
ModelName "SyncMaster"
HorizSync 30.0 - 81.0
VertRefresh 56.0 - 75.0
Option "DPMS"
EndSection
Section "Device"
Identifier "NVIDIA 0"
Driver "nvidia"
VendorName "NVIDIA Corporation"
BoardName "GeForce 6800"
BusID "PCI:1:0:0"
Screen 0
EndSection
Section "Device"
Identifier "NVIDIA 1"
Driver "nvidia"
VendorName "NVIDIA Corporation"
BoardName "GeForce 6800"
BusID "PCI:1:0:0"
Screen 1
EndSection
Section "Screen"
Identifier "CRT (with TFT) Screen"
Device "NVIDIA 0"
Monitor "CRT Monitor"
DefaultDepth 24
Option "metamodes" "CRT: 1600x1200 +0+0"
Option "AllowGLXWithComposite" "true"
Option "RenderAccel" "true"
SubSection "Display"
Depth 24
Modes "1600x1200" "1280x1024" "1024x768" "800x600" "640x480"
EndSubSection
EndSection
Section "Screen"
Identifier "TFT(with CRT) Screen"
Device "NVIDIA 1"
Monitor "TFT Monitor"
DefaultDepth 24
Option "AllowGLXWithComposite" "true"
Option "RenderAccel" "true"
Option "metamodes" "DFP: 1280x1024_60 +0+0"
SubSection "Display"
Depth 24
Modes "1280x1024"
EndSubSection
EndSection