Hello,

> > figure out where the IRQ really came from. Can it do that with a PCI
> > bridge? I mean - is there a register in the bridge to indicate which slots
> > fired IRQs? So I guess everything on the USB card ( 3xOHCI, 1x EHCI )
> > should share the same virq, but the audio card should get a different one.
> 
> The following thread might answer some of your PCI bridge/interrupt
> questions:
> 
> http://mail-index.netbsd.org/tech-kern/2004/08/13/0002.html

Thanks, that confirms what I just found myself :)
So in my case there's only one shared interrupt - 25, pin C - used by ohci1 and yds0. ohci1 has no devices attached, the USB mouse is at ohci2 which uses 25 pin D so it remains to be seen why these interrupts run into a deadlock.

have fun
Michael