From: Robert Hancock <hancockr@shaw.ca>
To: Jeremy Fitzhardinge <jeremy@goop.org>,
linux-kernel <linux-kernel@vger.kernel.org>
Cc: "Brown, Len" <len.brown@intel.com>,
"Pallipadi, Venkatesh" <venkatesh.pallipadi@intel.com>
Subject: Re: Strange entries in /proc/acpi/thermal_zone for Thinkpad X60
Date: Thu, 12 Oct 2006 21:57:43 -0600 [thread overview]
Message-ID: <452F0EB7.2060508@shaw.ca> (raw)
In-Reply-To: <fa.P/oAhFV0AVrh8PKSKzP+xVGih2s@ifi.uio.no>
Jeremy Fitzhardinge wrote:
> 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:
>
So your machine has two thermal zones..
> The interesting thing is that the two sets of files are not consistent -
> sometimes they don't even show the same temperature.
I would expect they wouldn't, otherwise there would be no reason for the
BIOS people to set up two thermal zones..
>
> 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 believe
How do you know they are one for each core? ACPI thermal zones can be
anywhere in the machine that needs OS-controlled cooling. Could be the
CPU heatsink, voltage regulator, or someplace else.
> the CPU has ever approached either 97 C, let alone 127; while I put it
> under a fair amount of load, it is sitting on a desktop with no airflow
> obstructions, so if it really is overheating it suggests a serious
> design problem with the hardware.
>
> But I'm just speculating; I'm not really sure what all this means. Any
> clues?
I think we need more information to decide what is going on here.. what
temperatures are registering in the thermal zones when the CPU clock is
being limited?
--
Robert Hancock Saskatoon, SK, Canada
To email, remove "nospam" from hancockr@nospamshaw.ca
Home Page: http://www.roberthancock.com/
next parent reply other threads:[~2006-10-13 3:59 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <fa.P/oAhFV0AVrh8PKSKzP+xVGih2s@ifi.uio.no>
2006-10-13 3:57 ` Robert Hancock [this message]
2006-10-13 4:28 ` Strange entries in /proc/acpi/thermal_zone for Thinkpad X60 Jeremy Fitzhardinge
2006-10-13 18:10 ` Tomasz Torcz
2006-10-12 22:19 Jeremy Fitzhardinge
2006-10-13 4:53 ` Len Brown
2006-10-13 14:44 ` Pavel Machek
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