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Date: Sun, 21 Dec 2008 11:39:07 -0500
From: Nathan Lay <nslay@comcast.net>
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To: "Paul B. Mahol" <onemda@gmail.com>
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Cc: freebsd-current@freebsd.org, freebsd-stable <freebsd-stable@freebsd.org>
Subject: Re: Very serious cooling issues CURRENT/STABLE
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Paul B. Mahol wrote:
> On 12/21/08, Nathan Lay <nslay@comcast.net> wrote:
>   
>> acpi.thermal.min_runtime: 0
>> hw.acpi.thermal.polling_rate: 10
>> hw.acpi.thermal.user_override: 0
>> hw.acpi.thermal.tz0.temperature: 37.0C
>> hw.acpi.thermal.tz0.active: -1
>>     
> Is this one ever changed?
>
>   
>> hw.acpi.thermal.tz0.passive_cooling: 1
>> hw.acpi.thermal.tz0.thermal_flags: 0
>> hw.acpi.thermal.tz0._PSV: 89.5C
>> hw.acpi.thermal.tz0._HOT: -1
>> hw.acpi.thermal.tz0._CRT: 93.0C
>> hw.acpi.thermal.tz0._ACx: -1 -1 -1 -1 -1 -1 -1 -1 -1 -1
>>     
>
> This one means that coling will never be used, why:
> my output looks like this:
> hw.acpi.thermal.tz0._ACx: 85.0C 75.0C 60.0C 50.0C -1 -1 -1 -1 -1 -1
>
>   
>> hw.acpi.thermal.tz0._TC1: 5
>> hw.acpi.thermal.tz0._TC2: 4
>> hw.acpi.thermal.tz0._TSP: 600
>>     
>
> You can play with all thermal values once you enable:
> hw.acpi.thermal.user_override
>
> But acpi may redo such values again after some time.
> You only real workaround is to use modified acpi ASL:
> it is explained in handbook.
>
> In my case I fixed in that way bogus kernel
> message "_CRT value is absurd, ignored".
>
>
>   
hw.acpi never displayed thermal values for some reason.  However, after 
loading acpi_ibm, I can query those values without a problem
dev.acpi_ibm.0.thermal: 49 41 33 48 27 -1 22 -1

I'm not sure the critical temperature (99C) is a problem, but what I 
have observed is you should never be near it.  None of these thinkpads 
got over 80C under load with FreeBSD installed until recently.  ACPI's 
ASL does not appear to be the problem as it has worked correctly in the 
past.

Best Regards,
Nathan Lay