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

M. Warner Losh imp at bsdimp.com
Thu Aug 2 03:20:41 UTC 2007

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?


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