Re: [SOLVED] Re: [patch] enhance powerd(8) to handle max tempera
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Hajimu UMEMOTO wrote:
> Hi,
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>>>>>> On Tue, 31 Jul 2007 12:44:06 +0200
>>>>>> Pietro Cerutti <gahr@gahr.ch> said:
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> gahr> Nevermind, I finally got my passive cooling working.
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> Congratulation!
Thanx ;-)
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> 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.
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> The cpufreq is controlled according to the following formula:
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> P [%] =3D _TC1 * ( Tn - Tn-1 ) + _TC2 * ( Tn - _PSV )
> Pn =3D Pn-1 + HW[ - P ] where 0% <=3D Pn <=3D 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
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> 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:
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> Name (_TC1, Zero)
> Name (_TC2, 0x0C)
> Name (_TSP, 0x28)
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> 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:
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> http://www.acpi.info/DOWNLOADS/ACPIspec-2-0c.pdf
Maybe during vacation :-)
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> Sincerely,
Thanks for your help!
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> --
> Hajimu UMEMOTO @ Internet Mutual Aid Society Yokohama, Japan
> ume@mahoroba.org ume@{,jp.}FreeBSD.org
> http://www.imasy.org/~ume/
--=20
Pietro Cerutti
PGP Public Key:
http://gahr.ch/pgp
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