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SubjectRe: SMP irq sharing problem in 2.2.17
> I had a similar problem with the USB driver assigned to IRQ19 but not receiving any interrupts.
> Perhaps someone more knowledgable can explain why linux fails under MPS1.4.

Linux is fine with MPS1.4. There are two possible causes I see

1. Some clown built a USB controller with only 4 bits of the IRQ line
writable/checkable. We've seen sound chips with that 'feature'

2. The MPS 1.4 tables in the BIOS are wrong. Remarkably common problem

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