[RFC] Patch to enable temperature ceiling in powerd

[Hajimu UMEMOTO]

Hi,

>>>>> On Sat, 16 Feb 2008 18:06:12 +0100
>>>>> Johannes Dieterich <dieterich.joh at googlemail.com> said:

> dieterich.joh> # hw.acpi.thermal.tz1.passive_cooling=1
> dieterich.joh> su: hw.acpi.thermal.tz1.passive_cooling=1: command not found
> 
> It should be `sysctl hw.acpi.thermal.tz1.passive_cooling=1'.
dieterich.joh> Sorry. Just a typing error. Works now. Should I try to make buildworld?

No problem.  Please make sure hw.acpi.thermal.tz1.passive_cooling is 1
by typing `sysctl hw.acpi.thermal.tz1.passive_cooling' before trying.
If hw.acpi.thermal.tz1.passive_cooling is 1, passive cooling should be
working.

You can see if passive cooling is actually working by setting
hw.acpi.verbose to 1 using sysctl.  While hw.acpi.verbose is 1,
changing cpufreq by passive cooling is logged into /var/log/messages
like:

Feb 17 02:26:19 kasuga kernel: acpi_tz0: temperature 86.8C: decreasing clock speed from 1200 MHz to 1000 MHz
Feb 17 02:26:23 kasuga kernel: acpi_tz0: temperature 78.8C: resuming previous clock speed (1200 MHz)

Sincerely,

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