From owner-freebsd-stable@FreeBSD.ORG  Mon Aug 27 13:51:19 2012
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Date: Mon, 27 Aug 2012 20:44:59 +0800
From: Mike Manilone <crtmike@gmx.us>
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Subject: Temperature too high when high overload
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Hi all,

I just switched from Fedora Linux to FreeBSD. But I noticed a problem, 
the CPU temperature will be very high when the load is high. Especially 
while I am building C++ programs. It shut down for even 3 times while I 
was building Firefox/Thunderbird, just because of high temperature (86.5C).

One of my friends told me, "FreeBSD doesn't support your ACPI well" but 
I noticed that while I'm not compiling ports, the temperature will be 
not too high.

Just now I'm building LLVM, here's what I've seen:

     > sysctl hw.acpi.thermal.tz0.temperature
     hw.acpi.thermal.tz0.temperature: 84.5C
     > pkill make
     > sysctl hw.acpi.thermal.tz0.temperature
     hw.acpi.thermal.tz0.temperature: 67.5C

I'm using Dell Vostro 3400 laptop PC with FreeBSD 9.1-RC1.
     > uname -a
     FreeBSD bsd.laptop.mike 9.1-RC1 FreeBSD 9.1-RC1 #0: Tue Aug 14 
04:25:06 UTC 2012 
root@farrell.cse.buffalo.edu:/usr/obj/usr/src/sys/GENERIC  amd64

There's my dmesg message: http://slexy.org/view/s21b7xTTsu

Anyone knows how to fix this problem?  Thank you.

Yours Sincerely,
Mike Manilone