dual head with 2 graphic cards issue

[Nicoco <truenicoco@gmail.com>]

sorry if i post this msg twice but i'm not sure that it was successfully 
sended first time...

Hello everybody,

i'm trying to use my computer with 2 monitors connected on 2 different 
graphic cards.

My first graphic card is an ATI Radeon 9250 (AGP) and the second one is 
a Matrox Mystique PCI (mga1064sg)
I can use them separately by choosing one of them as "Display init 
first" in the BIOS menu.

when i try to use them both :
- if the ATI is the principal device, my system crashes with a black 
screen on the ATI-connected monitor and the wakeup message on the other 
monitor (something like (c)Matrox accelerated graphics ...). i cannot 
even ctrl+alt+backspace. the strangest thing is that i cannot find any 
error messages in the Xorg.log !
- if the MATROX is the principal device, X starts but only on the 
matrox-connected monitor, the other one showing the ATI wakeup message 
and Xorg.log with those lines :
(EE) fglrx(0): CAIL: CAILNoBiosInitializeAdapter failed, error 1
(EE) fglrx(0): GetBIOSParameter failed
(EE) fglrx(0): PreInitConfig failed
(EE) fglrx(0): R200PreInit failed
(II) fglrx(0): === [R200PreInit] === end

i use debian sid and ATI non-free drivers (stanchina packages)
i've already tried to disable the DRI section of my xorg.conf

So if anyone has any idea please help me !!!

thanks a lot for reading until the end ;o)

here is my xorg.conf :

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

Section "Files"
           # local font server
   # if the local font server has problems, we can fall back on these
   FontPath     "unix/:7100"
   FontPath     "/usr/share/fonts/X11/misc"
   FontPath    "/usr/share/fonts/X11/misc"
   FontPath     "/usr/lib/X11/fonts/misc"
   FontPath     "/usr/share/fonts/X11/cyrillic"
   FontPath    "/usr/share/fonts/X11/cyrillic"
   FontPath     "/usr/lib/X11/fonts/cyrillic"
   FontPath     "/usr/lib/X11/fonts/100dpi/:unscaled"
   FontPath     "/usr/lib/X11/fonts/75dpi/:unscaled"
   FontPath     "/usr/share/fonts/X11/Type1"
   FontPath    "/usr/share/fonts/X11/Type1"
   FontPath     "/usr/lib/X11/fonts/Type1"
   FontPath     "/usr/share/fonts/X11/CID"
   FontPath    "/usr/share/fonts/X11/CID"
   FontPath     "/usr/lib/X11/fonts/CID"
   FontPath     "/usr/share/fonts/X11/100dpi"
   FontPath    "/usr/share/fonts/X11/100dpi"
   FontPath     "/usr/lib/X11/fonts/100dpi"
   FontPath     "/usr/share/fonts/X11/75dpi"
   FontPath    "/usr/share/fonts/X11/75dpi"
   FontPath     "/usr/lib/X11/fonts/75dpi"
EndSection

Section "Module"
   Load  "bitmap"
   Load  "dbe"
   Load  "ddc"
   Load  "dri"
   Load  "evdev"
   Load  "extmod"
   Load  "freetype"
   Load  "glx"
   Load  "int10"
   Load  "record"
   Load  "type1"
   Load  "vbe"
#    Load  "v4l"
EndSection

Section "InputDevice"
   Identifier  "Generic Keyboard"
   Driver      "keyboard"
   Option        "CoreKeyboard"
   Option        "XkbRules" "xorg"
   Option        "XkbModel" "pc105"
   Option        "XkbLayout" "fr"
   Option        "XkbVariant" "latin9"
EndSection

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

Section "Screen"
   Identifier "aticonfig Screen 0"
   Device     "ATI Graphics Adapter 0"
   Monitor    "aticonfig Monitor 0"
   DefaultDepth     24
   SubSection "Display"
       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


--

Nicoco