On Mon, 14 Feb 2000, Olaf Titz wrote:
> > IRQ9 usually works, but gives me the ``suprious interrupt on IRQ7'' error.
> > IRQ7 with the new driver works the best, but still far from perfect.
> >
> > Is this a good indication that I should go see my vendor and eventually
> > beat him up with the notebook, or could the spurious interrupt on IRQ7 be
> > a kernel issue ? It does happen both on 2.2 and 2.3 though...
>
> It looks like either you have to shuffle around some IRQ settings in
> the BIOS, or your HW/BIOS is really broken.
>
> IRQ7 was used by the traditional PC interrupt controller to indicate a
> spurious interrupt that the interrupt controller did not know how to
> handle, perhaps by a glitch in the IRQ line. Not sure if this applies
> to modern HW too, but the rule has always been "expect unexpected
> IRQ7" and for the same reason it is usually assigned to the printer
> port, because that counts as unimportant to handle IRQs for. :-)
> I've not checked but perhaps this needs to be handled in the kernel
> better.
>
> But your problem could also be due to a simple resource conflict.
> There are non-obvious cases, like the Bt848 card that would reliably
> lock up my PC when given IRQ14 or 15. Turns out that somehow the
> onboard IDE controllers wanted those for themselves despite them both
> being disabled in the BIOS (and thus the BIOS thought those were
> available for PCI). I could only solve that by assigning every PCI
> card its IRQ by hand. A similar problem usually exists with the PS/2
> mouse port on IRQ12.
>
> Olaf
>
IRQ7 has always been connected to the printer port. The interrupt
controller handles it just like all the other PWB traces going
to it. It is not an "unknown" interrupt.
Cheers,
Dick Johnson
Penguin : Linux version 2.3.41 on an i686 machine (800.63 BogoMips).
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