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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