Another acpi_thermal nit
Nate Lawson
nate at root.org
Thu Sep 8 17:19:10 PDT 2005
Hajimu UMEMOTO wrote:
>>>>>>On Thu, 08 Sep 2005 08:32:35 -0700
>>>>>>"Kevin Oberman" <oberman at es.net> said:
>
>
> oberman> It would really be nice to be able to slow the system below where
> oberman> acpi_thermal has lowered it. I just don't know if this is a matter of
> oberman> code or a BIOS issue with no way out.
>
> Yup, I understand your needs. But, it is rather by design of
> acpi_thermal. However, you can stop passive cooling by setting
> hw.acpi.thermal.tz0.passive_cooling to zero even when passive cooling
> is active. You can do the following step:
>
> 1) sysctl hw.acpi.thermal.tz0.passive_cooling=0
> 2) Set your favorite CPU speed by dev.cpu.0.freq
> 3) sysctl hw.acpi.thermal.tz0.passive_cooling=1
Our acpi_thermal code switches between active and passive cooling
strategies when going off battery power. So it is likely that your
system only uses passive cooling so aggressively when offline.
ume@'s suggestion is the best approach I think.
--
Nate
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