Subject: Re: ACPI PM Timer vs. C1 halt issue
From: john stultz <johnstul@us.ibm.com>
To: "Prakash K. Cheemplavam" <PrakashKC@gmx.de>
Cc: lkml <linux-kernel@vger.kernel.org>, Andrew Morton <akpm@osdl.org>,
       Linus Torvalds <torvalds@osdl.org>, len.brown@intel.com
In-Reply-To: <404E38B7.5080008@gmx.de>
References: <404E38B7.5080008@gmx.de>
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Date: Tue, 09 Mar 2004 14:11:30 -0800
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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?

thanks
-john

thanks
-john

-
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