Problem configuring two XServer instances for different displays on single video card
 

I have NVIDIA GF 8800GT with two DVI ports. I want each instance of X Server to display on different monitor, i.e. if i start 'startx', the server is started on monitor #0. If i start 'startx -- :1 -layout withscreen1', it would use monitor #1. But i have some problem. X server says:
{

(WW) NVIDIA: No matching Device section for instance (BusID PCI:1:0:0) found
(EE) Screen 0 deleted because of no matching config section.

}
This is my xorg.conf:
{

Section "Files"
RgbPath "/usr/lib/X11/rgb"
ModulePath "/usr/lib/modules"
FontPath "/usr/lib/X11/fonts/misc/"
FontPath "/usr/lib/X11/fonts/TTF/"
FontPath "/usr/lib/X11/fonts/Type1/"
FontPath "/usr/lib/X11/fonts/CID/"
FontPath "/usr/lib/X11/fonts/75dpi/"
FontPath "/usr/lib/X11/fonts/100dpi/"
EndSection

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

Section "ServerLayout"
Identifier "WithScreen0"
Screen 0 "Screen0" 0 0
InputDevice "Mouse0" "CorePointer"
InputDevice "Keyboard0" "CoreKeyboard"
EndSection

Section "ServerLayout"
Identifier "WithScreen1"
Screen 0 "Screen1" 0 0
InputDevice "Mouse1" "CorePointer"
InputDevice "Keyboard0" "CoreKeyboard" # Will be replaced by added keyboard
EndSection

Section "ServerFlags"
Option "Xinerama" "0"
Option "DefaultServerLayout" "WithScreen0"
EndSection

Section "InputDevice"
Identifier "Keyboard0"
Driver "kbd"
Option "XkbRules" "xorg"
Option "XkbModel" "pc105"
Option "XkbLayout" "us,ru(winkeys)"
Option "XkbOptions" "grp:alt_shift_toggle,grp_led:scroll"
EndSection

Section "InputDevice"
Identifier "Mouse0"
Driver "mouse"
Option "Protocol" "auto"
Option "Device" "/dev/input/mouse0"
Option "ZAxisMapping" "4 5 6 7"
EndSection

Section "InputDevice"
Identifier "Mouse1"
Driver "mouse"
Option "Protocol" "auto"
Option "Device" "/dev/input/mouse1"
Option "ZAxisMapping" "4 5 6 7"
EndSection

Section "Monitor"
Identifier "Monitor0"
VendorName "Samsung Electronics"
ModelName "Samsung SyncMaster 193p+"
HorizSync 30.0 - 81.0
VertRefresh 56.0 - 76.0
EndSection

Section "Monitor"
Identifier "Monitor1"
VendorName "Samsung Electronics"
ModelName "Samsung SyncMaster 193p+"
HorizSync 30.0 - 81.0
VertRefresh 56.0 - 76.0
EndSection

Section "Device"
Identifier "NVidia8800scr1"
Driver "nvidia"
VendorName "NVIDIA Corporation"
BoardName "GeForce 8800 GT"
BusID "PCI:1:0:0"
Screen 1
Option "TripleBuffer" "True"
Option "NoLogo" "True"
Option "BackingStore" "True"
Option "DamageEvents" "True"
Option "DPMS" "True"
Option "OnDemandVBlankInterrupts" "True"
Option "Coolbits" "1"
EndSection

Section "Device"
Identifier "NVidia8800scr0"
Driver "nvidia"
VendorName "NVIDIA Corporation"
BoardName "GeForce 8800 GT"
BusID "PCI:1:0:0"
Screen 0
Option "TripleBuffer" "True"
Option "NoLogo" "True"
Option "BackingStore" "True"
Option "DamageEvents" "True"
Option "DPMS" "True"
Option "OnDemandVBlankInterrupts" "True"
Option "Coolbits" "1"
EndSection

Section "Screen"
Identifier "Screen0"
Device "NVidia8800scr0"
Monitor "Monitor0"
DefaultDepth 24
Option "VBERestore" "true"
Option "TwinView" "0"
Option "metamodes" "1280x1024_60 +0+0"
Option "VBERestore" "true"
SubSection "Display"
Depth 24
EndSubSection
EndSection

Section "Screen"
Identifier "Screen1"
Device "NVidia8800scr1"
Monitor "Monitor1"
DefaultDepth 24
Option "VBERestore" "true"
Option "TwinView" "0"
Option "metamodes" "1280x1024_60 +0+0"
Option "VBERestore" "true"
SubSection "Display"
Depth 24
EndSubSection
EndSection

}

If i change
Section "ServerLayout"
Identifier "WithScreen1"
Screen 0 "Screen1" 0 0
InputDevice "Mouse1" "CorePointer"
InputDevice "Keyboard0" "CoreKeyboard" # Will be replaced by added keyboard
EndSection

to

Section "ServerLayout"
Identifier "WithScreen1"
Screen 0 "Screen0" 0 0
InputDevice "Mouse1" "CorePointer"
InputDevice "Keyboard0" "CoreKeyboard" # Will be replaced by added keyboard
EndSection

then it starts, but on first screen, while i want it to be on the second one.

What am i doing wrong?

You man need to run one instance of X per card or even one per computer. You can use twinview to configure the screens the way you want. I have never heard of running multiple instances of X. Each one would try to use the nvidia kernel module and I don't know if that is kosher.

If you are trying to setup a multiseat system, this site might help. They have entries in a single xorg.conf. The article is a little old and the current X server may work better doing this than in the past.

The error messages indicate that the busID entries are wrong. If you use two or more video cards, then you have to have a busID entry for each card. Your xorg.conf file has the same busID value for both cards.

http://www.linuxtoys.org/multiseat/multiseat.html