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Date: Tue, 30 Nov 2004 16:21:42 -0800
From: Nate Lawson <nate@root.org>
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To: "Wilkinson, Alex" <alex.wilkinson@dsto.defence.gov.au>
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cc: freebsd-acpi@freebsd.org
Subject: Re: ACPI differences 4.10 - 5.3, laptop problem
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Wilkinson, Alex wrote:
>    0n Tue, Nov 30, 2004 at 10:05:46AM -0800, Kevin Oberman wrote: 
>    
>    > Looks like the same processor I have and you can try adding:
>    > options	   CPU_ENABLE_TCC
>    > to your kernel. This enables the P4 Thermal Control which will let you
>    > throttle the speed of the CPU without ACPI. Use the hw.p4tcc sysctls to
>    > manage the speed.
> 
> Kevin, why don't you use 'C states' for the afforementioned ?
> Throttling reduces CPU performance. I thought it would be better to
> use C1,C2,C3, states. Or does fbsd ACPI not support C states yet ?

It's supported them since 5.2 a year and a half ago, including static 
_CST support.  This is equivalent to Linux.  Also, support is automatic 
so he doesn't need to configure them.

-- 
Nate