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From: "Wilkinson, Alex" <alex.wilkinson@dsto.defence.gov.au>
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Subject: Re: ACPI differences 4.10 - 5.3, laptop problem
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   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 ?

 - aW