ACPI temperature

[Steven Friedrich]

I sent this to questions last Sunday, but only one person responded. He's 
running FreeBSD 8 and I think his system is reporting bogus temps too.
I think there might be a missing scaling factor. I'm a hardware guy, but I 
don't currently have temperature measuring equipment and I would want to do it 
on one of my towers (which are currently in storage), not my laptop anyway.

I booted my HP Pavilion zd8215us and I immediately invoked chkCPUTemperature.
The first temp reported was 52C, which is 125.6F. This leads me to believe
that acpi has an anomaly regarding temperature measurement. The ambient temp 
was 71F (21.6C). The machine had been off for over eight hours.

Here's chkCPUTemperature:

#!/bin/sh
# $Id:$
#

# CPU Temperature Information from ACPI
POLLING_RATE=`sysctl hw.acpi.thermal.polling_rate|awk '{print $2}'`
while [ 1 ]
do
	sysctl hw.acpi.thermal.tz0.temperature
	sleep $POLLING_RATE
done

uname -a
FreeBSD laptop2.StevenFriedrich.org 7.2-RELEASE-p4 FreeBSD 7.2-RELEASE-p4 #1: 
Sat Oct  3 18:47:43 EDT 2009     
root at laptop2.StevenFriedrich.org:/usr/obj/usr/src/sys/LAPTOP  i386