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To: Kevin Oberman <oberman@es.net>
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Cc: Melvyn Sopacua <freebsd.stable@melvyn.homeunix.org>,
	freebsd-stable@freebsd.org
Subject: Re: HEADS UP: Release schedule for 2006
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Kevin Oberman wrote:
>>Date: Fri, 16 Dec 2005 14:29:39 -0600
>>From: Craig Boston <craig@feniz.gank.org>
>>Sender: owner-freebsd-stable@freebsd.org
>>
>>
>>>-cpu0: <ACPI CPU (4 Cx states)> on acpi0
>>>+cpu0: <ACPI CPU> on acpi0
>>>
>>>Q: Guessing that's a formatting difference, rather then 6.x not recognizing 
>>>the states (sysctl hw.acpi.cpu.cx_supported confirms 4 states)
>>
>>Not sure on this, but you're probably better off using EST anyway as I
>>think it gives you more control over the processor frequency.
> 
> 
> No. There is no conflict between Cx states and EST. Cx states specifies
> how deeply the CPU will sleep when idle. EST controls processor speed
> and voltage. In most cases, your REALLY want to use both of these. They
> are very significant in saving power. (Of course, USB tends to limit the
> effectiveness of Cx states. I need to run without USB to get really good
> battery life and to make suspend (S3) really ut power drain.


Kevin,

I used to have 3 Cx states supported when I started with FreeBSD on 
version 5.3.  Since I upgraded to 5.4 and recently to 6.0, all I can see 
is just one supported Cx state.  I much wonder why. (?)

Cheers,

Martin