2 graphic cards and 2 display's

[messmate <messmate@free.fr>]

Hi list,
here is my big problem:
I've a CAD-CAM system equiped with 1 big monitor (for the drawing's) 
and 1 litte(15") who's display the menu.
The graphic cards are :
1 double artist-card for the drawings monitor.
1 trident TGUI9440 card for the 15" monitor.

I've installed on other partitions debian woody.
But can't get working the xserver on the 15" monitor with his trident
card.
Setted the pci id bus as " PCI:0:12:0" after a lspci to detect it.
And the xserver won't start; the message is :
"TRIDENT: no matching device section for instance (Bus ID PCI:0:18:0)
found. No devices detected."

I've setted the bus ID to 12 and not 18 !!!

What can I o ?
Any help would be very appreciated.

mess-mate