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Date: Mon, 24 Jan 2005 14:49:10 +0000 (GMT)
From: Robert Watson <rwatson@FreeBSD.org>
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To: "Alexandre \"Sunny\" Kovalenko" <Alex.Kovalenko@verizon.net>
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Subject: Re: Notebook fan stuck on?
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On Sat, 22 Jan 2005, Alexandre "Sunny" Kovalenko wrote:

> What does
> 
> sysctl hw.acpi.thermal
> 
> say? 
> 
> Starting point would be looking at whether 
> 
> sysctl hw.acpi.thermal.tzN.temperature
> 
> changes with time. (for all N your notebook provided).

paprika:~> sysctl sysctl hw.acpi.thermal
hw.acpi.thermal.min_runtime: 0
hw.acpi.thermal.polling_rate: 10
hw.acpi.thermal.tz0.temperature: 49.5C
hw.acpi.thermal.tz0.active: -1
hw.acpi.thermal.tz0.thermal_flags: 0
hw.acpi.thermal.tz0._PSV: -1
hw.acpi.thermal.tz0._HOT: -1
hw.acpi.thermal.tz0._CRT: 98.0C
hw.acpi.thermal.tz0._ACx: -1 -1 -1 -1 -1 -1 -1 -1 -1 -1

(pause 20 seconds)

paprika:~> sysctl hw.acpi.thermal.tz0.temperature
hw.acpi.thermal.tz0.temperature: 48.5C

(pause 10 seconds)

paprika:~> sysctl hw.acpi.thermal.tz0.temperature
hw.acpi.thermal.tz0.temperature: 53.5C

(pause 10 seconds)

paprika:~> sysctl hw.acpi.thermal.tz0.temperature
hw.acpi.thermal.tz0.temperature: 49.5C

Seems like it's jumping around a bit.  A lot, even.  However, if I run
sysctl -n hw.acpi.thermal.tz0.temperature in a loop separated by sleep 10,
while running a "du /"  the results seem fairly predictable:

48.5C
48.5C
48.5C
49.5C
48.5C
49.5C
49.5C
49.5C
50.5C
50.5C
50.5C
51.5C
50.5C
51.5C
50.5C

Other than the critical temperature threshold, is it possible to retrieve
other thresholds from the kernel/ACPI?

Robert N M Watson