Re: Interrupt problem, no USB on SMP machine with 2.4.19/20/21

Alan Cox (
07 Mar 2003 23:35:50 +0000

On Fri, 2003-03-07 at 22:13, Greg KH wrote:
> Have you booted with "noapic" on the command line? That's the only way
> a lot of VIA motherboards will get their onboard USB controller to work
> properly.

VIA onboard devices require the interrupt line and pin are both written in
APIC mode. Linux for reasons I still don't understand does not do that by
default. The current -ac tree has a quirk for this although it doesnt seem
to be working for all cases and needs a victim to review it more carefully

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