[patch] enhance powerd(8) to handle max temperature
M. Warner Losh
imp at bsdimp.com
Thu Aug 2 04:53:35 UTC 2007
In message: <46B15166.1070305 at elischer.org>
Julian Elischer <julian at elischer.org> writes:
: 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)
The values are always the same. ACx is always 40C -1 ... and
temperature is always 0.
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