Need to compile a new kernel for this thing w/o tridentfb - doesn't work right on my system for some reason.
<dmesg - haven't compiled a 2.6.9 for it yet>
PCI: PCI BIOS revision 2.10 entry at 0xfd930, last bus=6
PCI: Using configuration type 1
Linux Kernel Card Services
options: [pci] [cardbus] [pm]
PCI: Probing PCI hardware
PCI: Probing PCI hardware (bus 00)
IRQ router is missing.
PCI: No IRQ known for interrupt pin A of device 0000:00:02.0. Please try using pci=biosirq.
PCI: No IRQ known for interrupt pin B of device 0000:00:02.1. Please try using pci=biosirq.
00:00.0 Class 0600: 8086:1235 (rev 02)
00:01.0 Class 0601: 8086:122e (rev 02)
00:02.0 Class 0607: 104c:ac12 (rev 04)
00:02.1 Class 0607: 104c:ac12 (rev 04)
00:03.0 Class 0300: 1023:9660 (rev d3)
00:05.0 Class 0400: 1014:0057
No PCI interrupt routing table was found.
Interrupt router at 00:01.0: Intel 82371FB PIIX PCI-to-ISA bridge
PIRQ1 (link 0x60): irq 11
PIRQ2 (link 0x61): irq 11
PIRQ3 (link 0x62): unrouted
PIRQ4 (link 0x63): unrouted
Serial IRQ: [disabled] [quiet] [frame=17] [pulse=4]
Level mask: 0x0800 
It looks that you have same problem and kernel doesn't find IRQ
router. So try attached patch (for 2.6.9 and added your bridge) if it helps.
I think that it may help (look at dump_pirq results).
You can try turn on DEBUG (in file arch/i386/pci/pci.h) and see debug
messages on screen.