From owner-freebsd-acpi@FreeBSD.ORG  Tue Jan 17 20:00:06 2006
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Date: Tue, 17 Jan 2006 12:00:24 -0800
From: Nate Lawson <nate@root.org>
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To: Ulrich Spoerlein <q@galgenberg.net>
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Cc: acpi@freebsd.org
Subject: Re: powerd: How to really disable acpi_throttle?
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Ulrich Spoerlein wrote:
> Hi guys,
> 
> I put
> 
> hint.acpi_perf.0.disabled="1"
> hint.acpi_throttle.0.disabled="1"
> 
> into /boot/loader.conf and /boot/device.hints, but the acpi_throttle
> module still seems to attach
> 
> % dmesg|grep cpu
> cpu0: <ACPI CPU> on acpi0
> est0: <Enhanced SpeedStep Frequency Control> on cpu0
> p4tcc0: <CPU Frequency Thermal Control> on cpu0

acpi_throttle and p4tcc are different drivers.  So:

hint.p4tcc.0.disabled="1"

> Btw, who decides how those frequencies are chosen? Is the 600MHz setting
> made by 600MHz-EST * 100% throttle or is it 1200MHz-EST and 50%
> throttle?

There is a optimization phase in cpufreq that prefers frequencies 
generated by absolute drivers more than relative.  So 600 * 100% would 
be chosen, not 1200 * 50%.

-- 
Nate