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

Hajimu UMEMOTO wrote:
Hi,

On Tue, 31 Jul 2007 12:44:06 +0200
Pietro Cerutti <gahr@xxxxxxx> said:

gahr> Nevermind, I finally got my passive cooling working.

Congratulation!

Thanx ;-)


gahr> I don't know if the values of _TC1, _TC2 and TSP are meaningful, but it
gahr> seems to work for me, having a _PSV value of 65C.
gahr> Any suggestions on those values are welcome.

The cpufreq is controlled according to the following formula:

P [%] = _TC1 * ( Tn - Tn-1 ) + _TC2 * ( Tn - _PSV )
Pn = Pn-1 + HW[ - P ] where 0% <= Pn <= 100%

Been there, done that ;-) I saw this formula on the ACPI specs, but I
feel like I don't have the knowledge to tailor _TC1 and _TC2 to my


And, this evaluation is examined every _TSP / 10 second.
I'm not sure which values are appropriate for your box, but my laptop
has the following values:

Name (_TC1, Zero)
Name (_TC2, 0x0C)
Name (_TSP, 0x28)

The values are same as you chose.

;-) I took the first two values I found in an ACPI asl on the net.

Please refer the following document for detail:

http://www.acpi.info/DOWNLOADS/ACPIspec-2-0c.pdf

Maybe during vacation :-)


Sincerely,

Thanks for your help!


--
Hajimu UMEMOTO @ Internet Mutual Aid Society Yokohama, Japan
ume@xxxxxxxxxxxx ume@{,jp.}FreeBSD.org
http://www.imasy.org/~ume/


--
Pietro Cerutti

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