Date: Mon, 4 Apr 2005 17:42:34 -0400 (EDT)
From: Christopher Allen Wing <wingc@engin.umich.edu>
To: Mikael Pettersson <mikpe@csd.uu.se>
cc: linux-kernel@vger.kernel.org
Subject: Re: clock runs at double speed on x86_64 system w/ATI RS200 chipset
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On Mon, 4 Apr 2005, Mikael Pettersson wrote:

> In principle ACPI shouldn't be needed, but in its absence the
> BIOS must provide an MP table and the x86-64 kernel must still
> have code to parse it -- otherwise I/O APIC mode won't work.
> I don't know if that's the case or not.

Thanks. What I meant is that I thought distributions are enabling ACPI by
default because the mptable is likely to be broken.

> I suggest you boot normally (with ACPI fully enabled) and send a
> bug report to LKML and the ACPI list with the interrupt routing
> info from the kernel log.

I entered a bug report under ACPI on the kernel bugzilla:

	http://bugme.osdl.org/show_bug.cgi?id=4442

containing the relevant information. It looks like booting with 'noapic'
on the command line will be an acceptable workaround for now.


Thanks,

Chris
wingc@engin.umich.edu
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