Re: [PATCH] x86: Disable HPET MSI on ATI SB700/SB800

[Robert Hancock]

On Tue, May 18, 2010 at 2:45 AM, Andi Kleen <andi@xxxxxxxxxxxxxx> wrote:
>> If one wanted, you could disable HPET MSI on this chipset only when a
>> driver requests an ISA DMA channel. Then if there's no floppy or other LPC
>> DMA device present, it can stay enabled. I don't know if it's worth the
>> trouble, though.
>
> There can be LPC devices which are not visible to the kernel,
> but only used through ACPI or the BIOS. Think of fancy fan
> controllers and similar.

I would hope they wouldn't use DMA without kernel knowledge, otherwise
that really would be an abomination..
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