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

[Julian Elischer]

Julian Elischer wrote:
> Garrett Cooper wrote:
>> M. Warner Losh wrote:
>>> In message: <46AE8F78.1060203 at root.org>
>>>             Nate Lawson <nate at root.org> writes:
>>> : Hajimu UMEMOTO wrote:
>>> : >>>>>> On Mon, 30 Jul 2007 23:31:33 +0200
>>> : >>>>>> Pietro Cerutti <gahr at 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)

I might add, after all cooling down to room temperature over night.

>