- AGP, build-in VGA, PCI-1 and PCI-5 share an IRQ
- PCI-2, PCI-6 and AC97 share an IRQ
- PCI-3 has an IRQ
- PCI-4 and USB controllers-1 share an IRQ
Manually assigning the IRQs is possible in BIOS "PnP/PCI configuration"
submenu,
- PIRQ_0 is for AGP, build-in VGA, PCI-1 and PCI-5
- PIRQ_1 is for PCI-2, PCI-6 AND AC97
- PIRQ_2 is for PCI-3
- PIRQ_3 is for PCI-4 and USB controller-1
PS. The IRQ of USB controller-2 is arbitrated by ICH2 automaticaly
and can't be manually assigned to a specific one.
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