Xinerama con tarjetas nvidia y s3virge

Configuración de xorg.conf para tener xinerama con 2 tarjetas gráficas distintas (cada una con salida VGA y tv-out solamente).

Según lspci la 1º tarjeta es una nVidia GeForce4 MX 440 AGP 8x y la 2º una S3 Inc. ViRGE/GX2.

La tarjeta nVidia va conectada a un monitor TFT Arnos Instruments F-417 de 1280x1024 puntos de resolución y la S3 a un CRT LG Studioworks 520Si de 1024x768.


xorg.conf

####### Files y Modules ########

Section "Files"
FontPath "/usr/share/X11/fonts/misc"
FontPath "/usr/share/X11/fonts/cyrillic"
FontPath "/usr/share/X11/fonts/100dpi/:unscaled"
FontPath "/usr/share/X11/fonts/75dpi/:unscaled"
FontPath "/usr/share/X11/fonts/Type1"
FontPath "/usr/share/X11/fonts/100dpi"
FontPath "/usr/share/X11/fonts/75dpi"
FontPath "/usr/share/fonts/X11/misc"
FontPath "/var/lib/defoma/x-ttcidfont-conf.d/dirs/TrueType"
EndSection

Section "Module"
Load "i2c"
Load "bitmap"
Load "ddc"
Load "extmod"
Load "freetype"
Load "glx"
Load "int10"
Load "type1"
Load "vbe"
Load "v4l"
Load "dbe"
EndSection

### Seccion Dispositivos de entrada ###

# Teclado
Section "InputDevice"
Identifier "Generic Keyboard"
Driver "kbd"
Option "CoreKeyboard"
Option "XkbRules" "xorg"
Option "XkbModel" "pc105"
Option "XkbLayout" "es"
EndSection

# Raton
Section "InputDevice"
Identifier "Configured Mouse"
Driver "mouse"
Option "CorePointer"
Option "Device" "/dev/input/mice"
Option "Protocol" "ExplorerPS/2"
Option "ZAxisMapping" "4 5"
Option "Emulate3Buttons" "true"
EndSection


###### Seccion Monitor #####

# Monitor izquierdo TFT
Section "Monitor"
Identifier "Monitor0"
VendorName "Unknown"
ModelName "Arnos Instruments F-417"
Option "DPMS"
EndSection

#Monitor derecho CRT
Section "Monitor"
Identifier "Monitor1"
VendorName "Unknown"
ModelName "lg"
Option "dpms"
EndSection

###### Seccion Device ######

# Tarjeta nVidia
Section "Device"
Identifier "Videocard0"
Driver "nvidia"
Option "AddARGBVisuals" "True"
Option "NoLogo" "True"
VendorName "NVIDIA Corporation"
BoardName "GeForce FX 5200"
BusID "PCI:1:0:0"
EndSection

# Tarjeta S3 ViRGE
Section "Device"
Identifier "s3"
Driver "s3virge"
VendorName "s3 inc"
BoardName "86c325"
BusID "PCI:0:11:0"
EndSection

###### Seccion Screen ######

Section "Screen"
Identifier "Screen nvidia0"
Device "Videocard0"
Monitor "Monitor0"
DefaultDepth 16
SubSection "Display"
Viewport 0 0
Depth 24
Modes "1024x768"
EndSubSection
EndSection

Section "Screen"
Identifier "Screen s3"
Device "s3"
Monitor "Monitor1"
DefaultDepth 16
SubSection "Display"
Viewport 0 0
Depth 24
Modes "1024x768"
EndSubSection
EndSection


# ======ServerLayout=========

Section "Extensions"
Option "RENDER" "Enable"
EndSection

Section "ServerLayout"
Identifier "BothTwinView"
Screen "Screen nvidia0"
Screen "Screen s3" RightOf "Screen nvidia0"
Option "Xinerama"
InputDevice "Configured Mouse" "CorePointer"
InputDevice "Generic Keyboard" "CoreKeyboard"
EndSection

~~o~~
Presenta alguna inestabilidad a la hora de arrancar, a veces hay que resetear y repetir el arranque con recovery mode ( cp xorg.conf-dos-monitores-dos-tarjetas xrog.conf y luego exit ).
Tambien observo que se congela el sistema al cerrar la sesion X. No vuelve al gdm, se queda la pantalla en negro y no responde a nada salvo el botón de reset.
Por lo demás, una vez que arranca funciona con las dos pantallas sin problema.