j'ai enlevé les lignes "screen" car si je la laisse la matrox ne s'initialise meme pas :

> (EE) Screen 1 deleted because of no matching config section.
> (II) UnloadModule: "mga"

NB : selon "man xorg.conf" la ligne screen est utile aux cartes ayant plusieurs sorties video

j'ai encore essayé plusieurs combinaisons sans succès (scientifiquement)
je poste mon xorg.conf actuel en esperant que vous allez y trouver une erreur ou me donner conseil.

Section "ServerLayout"
Identifier "Default Layout"
Option "Xinerama" "true"
Screen 0 "aticonfig Screen 0" 0 0
Screen 1 "deuxieme" Above "aticonfig Screen 0"
InputDevice "Generic Keyboard"
InputDevice "Configured Mouse"
EndSection

Section "Files"
(...)
EndSection

Section "Module"
(...)
EndSection

Section "InputDevice"
(...)
EndSection

Section "InputDevice"
(...)
EndSection

Section "Monitor"
Identifier "aticonfig Monitor 0"
EndSection

Section "Monitor"
Identifier "petitecran"
HorizSync 28-49
VertRefresh 43-72
EndSection

Section "Device"
Identifier "ATI Graphics Adapter 0"
Driver "fglrx"
BusID "PCI:1:0:0"
Screen 0
EndSection

Section "Device"
Identifier "Mystique"
Driver "mga"
BusID "PCI:2:0:0"
Screen 1 <- si je commente ca, la matrox s'initialise, sinon elle veut pas !
EndSection

Section "Screen"
Identifier "aticonfig Screen 0"
Device "ATI Graphics Adapter 0"
Monitor "aticonfig Monitor 0"
DefaultDepth 24
SubSection "Display"
Viewport 0 0
Depth 24
EndSubSection
EndSection

Section "Screen"
Identifier "deuxieme"
Device "Mystique"
Monitor "petitecran"
DefaultDepth 24
SubSection "Display"
Depth 24
Modes "800x600"
EndSubSection
EndSection

Section "DRI"
Mode 0666
EndSection

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