linux-kernel - Re: Strange entries in /proc/acpi/thermal

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Date:	Fri, 13 Oct 2006 14:44:57 +0000
From:	Pavel Machek <pavel@....cz>
To:	Jeremy Fitzhardinge <jeremy@...p.org>
Cc:	"Brown, Len" <len.brown@...el.com>,
	"Pallipadi, Venkatesh" <venkatesh.pallipadi@...el.com>,
	acpi-devel@...nel.org, cpufreq@...ts.linux.org.uk,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: Strange entries in /proc/acpi/thermal_zone for Thinkpad X60

Hi!

> I have a Thinkpad X60 with an Intel Core Duo T2400.  In 
> /proc/acpi/thermal_zone, I'm getting two subdirectories, 
> each with their own set of files:

Looks okay to me. One thermal zone is cpu temperature, and second is
temperature of something else.

> The interesting thing is that the two sets of files are 
> not consistent - sometimes they don't even show the same 
> temperature.

You have two (actually you have more, see tp_smapi) physical
thermometers.

> The reason I'm interested in this is that I think it's 
> behind some of my cpufreq problems.  Sometimes the 
> kernel decides that I just can't raise the max frequency 
> above 1GHz, because its been thermally limited (I've put 
> printks in to confirm that its the ACPI thermal limit on 
> the policy notifier chain which is limiting the max 
> speed).  It seems to me that having a thermal zone for 
> each core is a BIOS bug, since they're really the same 
> chip, but the THM1 entries should be ignored.  I don't 

THM1 does not seem to be cpu temperature.

							Pavel
-- 
Thanks for all the (sleeping) penguins.
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