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Date: Wed, 11 Jun 2014 01:33:22 +1000 (EST)
From: Ian Smith <smithi@nimnet.asn.au>
To: Eric Neblock <cen5848@louisiana.edu>
Subject: Re: Missing: hw.acpi.thermal.tz%d._HOT
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On Tue, 10 Jun 2014 09:54:14 -0500, Eric Neblock wrote:
 > Hello all,
 >   I'm trying to figure out what is the _HOT temperature on my particular
 > processor. I'm running FreeBSD 10 GENERIC on a Sunfire X2200.
 > 
 > The processor is an Dual Core AMD Opteron 2218.
 > 
 > In the GENERIC kernel, acpi is built in; so, kldload acpi fails. I've
 > also loaded the amdtemp module at boot time to figure out what the
 > current temp of the processor is.
 > 
 > With all of that, when performing `sysctl -a` I never seem to be able to
 > pull up the _HOT value. 
 > 
 > Are there any suggestions on how to be able to view it?

Many thermal zones seen, including some CPUs, don't specify any _HOT 
value, just _PSV and _CRT, which should trigger passive cooling (eg 
clock slowing or throttling) and emergency shutdown, respectively.

What says 'sysctl hw.acpi.thermal' ?

cheers, Ian