Re: ACPI PM Timer vs. C1 halt issue

From: john stultz
Date: Tue Mar 09 2004 - 17:12:58 EST

On Tue, 2004-03-09 at 13:35, Prakash K. Cheemplavam wrote:
> I found out what causes higher idle temps when using mm-sources and
> 2.6.4-rc vanilla sources: If I use PM Timer as timesource, it seems the
> C1 halt isn't properly called, at least CPU disconnect doesn't seem to
> work, thus leaving my CPU as hot as without disconnect.
> using tsc timesource: idle temps of about 45-47°C
> using pm timer: 52-53°C idle temps
> Is this a bug or a feature?
> I have nforce2 hardware. Tell me if you need anything else.

Sounds like a bug. I'm not very familiar w/ the ACPI cpu power states,
is there anything you have to do to trigger C1 Halt? Or is it just
called in the idle loop?



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