Having a look at what actually is using IRQ #16 I find this: 16: 206725 3597 3021 3136 IR-IO-APIC 16-fasteoi ehci_hcd:usb1, SAA716x Core, SAA716x Core There was also Firewire IEEE1394 attached as well, I have since disabled it via jumper pin on M/B. Just to quickly mention that the motherboard is a ...