G550 and Dual View on kernel 2.6

I'm using Matrox G550 PCI version with dual view support.
My kernel is 2.6.18-1.2798 from Fedora Core 6.

lspci show me only one BusID:
PCI:2:0:0 VGA compatible controller: Matrox Graphics....

I can't see two BusID from lspci (like 2:0:0 and 2:4:0 or something
like that) and if I enable
Screen 0
Screen 1
in Device section I can see only freezing screens!

Have you any suggestion??
THANKS!