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SubjectRe: [PATCH 2/2] acpi: Disable IRQ 0 through I/O APIC for some HP systems

* Rafael J. Wysocki <> wrote:

> Appended is a patch that actually works for me (it's missing the i386
> part, but I can't test that anyway).
> Please note two things:
> (1) The whole acpi_dmi_table[] thing originally depended on __i386__, so it
> wouldn't work on x86-64 no matter what. I removed that dependecy, but
> I have no idea why it was there and so I'm not sure if that's correct.

> (2) The clear_IO_APIC_pin(apic1, pin1) done if
> disable_irq0_through_ioapic is true is absolutely essential. The
> symptoms are 100% reproducible without it.

thanks, applied to tip/x86, to give this some more testing.

the clear_IO_APIC_pin() is the most worrisome aspect of the change - but
since we are already in limited quirk mode, does it hurt? Maciej, any


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