Re: [patch] enhance powerd(8) to handle max temperature


Garrett Cooper wrote:
> M. Warner Losh wrote:
>> In message: <46AE8F78.1060203@root.org>
>>             Nate Lawson <nate@root.org> writes:
>> : Hajimu UMEMOTO wrote:
>> : >>>>>> On Mon, 30 Jul 2007 23:31:33 +0200
>> : >>>>>> Pietro Cerutti <gahr@gahr.ch> said:
>> : > gahr> My patch is really just a first draft that I wrote in order 
>> to have
>> : > gahr> feedbacks on the general idea to implement a temperature 
>> controlling
>> : > gahr> system inside powerd, and doesn't implement hysteresis as 
>> you noted, and
>> : > gahr> your feedback is that it's not a good idea, which I respect.
>> : > : > It is rather backward, IMHO.  I did implement a passive cooling
>> : > feature as an enhancement of powerd(8) like you did, during initial
>> : > phases.  Then, I implemented it in our kernel as a result.
>> : : I'll take a look at your patch.  Umemoto-san is right in that you 
>> really
>> : want the kernel to control cooling.  What happens if powerd dies/hangs
>> : and your system burns up?  Passive cooling is often a last resort to
>> : keep the system from overheating.
>>
>> I keep getting the system shutting down on my HP by FreeBSD because
>> the temperature exceeds the _CRT value.  Maybe there's something wrong
>> with my values, since it happens a lot:
>>
>> hw.acpi.thermal.min_runtime: 0
>> hw.acpi.thermal.polling_rate: 10
>> hw.acpi.thermal.user_override: 0
>> hw.acpi.thermal.tz0.temperature: 0.0C
>> hw.acpi.thermal.tz0.active: -1
>> hw.acpi.thermal.tz0.passive_cooling: 1
>> hw.acpi.thermal.tz0.thermal_flags: 0
>> hw.acpi.thermal.tz0._PSV: 90.0C
>> hw.acpi.thermal.tz0._HOT: -1
>> hw.acpi.thermal.tz0._CRT: 94.0C
>> hw.acpi.thermal.tz0._ACx: 40.0C -1 -1 -1 -1 -1 -1 -1 -1 -1
>>
>> Note: temperature is always 0.0C.
>>
>> What can I do to help my situation, if I really want the kernel doing
>> the cooling?
>>
>> Warner
>>   
> 
> Wow, something's really wrong with those calculated temperatures. At 
> that value most of the plastic and weaker circuitry should have fused 
> together =\.

It would be interesting to see what the values are just after booting,
or even earlier if you can get the bios to give temperatures 
(some MBs have that possibility)

> -Garrett
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