Re: IO-APIC on nforce2 [PATCH] + [PATCH] for nmi_debug=1 + [PATCH] for idle=C1halt, 2.6.5

[Andi Kleen]

Len Brown <len.brown@xxxxxxxxx> writes:

> While I don't want to get into the business of maintaining
> a dmi_scan entry for every system with this issue, I think
> it might be a good idea to add a couple of example entries
> for high volume systems for which there is no BIOS fix available.

Or do a generic fix: check for the PCI-ID of the Nforce2 and when
it is true and the timer is wrong just correct it. That's ugly,
but it's probably the best solution for such a common issue
(and the IO-APIC code is already filled with workarounds anyways)

One problem is that this likely must happen before the PCI quirks
run. In the x86-64 code I have special "early PCI scanning" code 
for this that could be copied. I don't have a Nforce2, but when
someone is willing to test I can do a patch for this.

-Andi

P.S.: This problem of reference BIOS bugs getting haunting Linux
even after they are long fixed is unfortunately common :-(

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