How to disable acpi thermal?

[Daniel Eischen]

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On Mon, 14 Jan 2008, Alexandre "Sunny" Kovalenko wrote:

>
> On Mon, 2008-01-14 at 21:56 -0500, Daniel Eischen wrote:
>>
>> Thermal zone 0 skyrockets past 110C in a couple of minutes
>> when trying to build a kernel.  All the other zones stay
>> relatively static.  I suspect something is wrong somewhere
>> because this machine is very lightly loaded and has never
>> had a problem until now.  I just upgraded it from 4.x to
>> 7.0.
>
> It need not to be bogus -- if I turn off fan on my ThinkPad it will
> overheat and shut itself down within couple of minutes of buildworld,
> starting from the relative cool state. From the look of the stuff below
> your fan should kick in no later then 10 seconds after tz0 reached 77C.
> Do you hear it running before shutdown? If yes, maybe lowering threshold
> in AC0 down from 77C will help. If not -- you will need to figure out
> who is supposed to turn on the fan. You can dump your ASL (instructions
> in the handbook) and post it someplace accessible -- I will take a look
> and maybe spot something interesting, but, being far from the expert in
> the field, I do not promise too much.

I posted the acpidump here:

   http://people.freebsd.org/~deischen/stl2.iasl

The problem is that acpi_thermal keeps shutting down the system
after 2 minutes into a buildkernel.  The system has no load other
than the buildkernel at the time it shuts down.

The system is a Intel STL2 Tupelo motherboard with 1 CPU, the
other CPU socket being occupied by a CPU terminator thingy.
I uncovered the rackmount system and watched it while building
a kernel.  With the cover off the acpi monitored temperature
went to 107C and stayed there.  It only took a minute or two
to get there.  I felt around inside the chassis and nothing
was even near being to warm or hot.  With the cover on, the
temperature goes to 111/112C before being shutdown by acpi_thermal
(the limit being 110C).  There is no way anything in that
chassis is anywhere near 100C.  I've disabled acpi_thermal
for now, but it'd be nice to get a better fix.

Any ideas?

-- 
DE