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From: Sean Bruno <seanbru@yahoo-inc.com>
To: Alexander Motin <mav@FreeBSD.org>
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Date: Mon, 02 Jul 2012 10:30:26 -0700
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Subject: Re: svn commit: r238004 - in head: etc/rc.d sys/dev/acpica
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On Mon, 2012-07-02 at 10:11 -0700, Alexander Motin wrote:
> >    This didn't break anything but led to a display of:
> >     * dev.cpu.0.cx_supported: C1/1 C2/96
> >
> >    Instead of
> >     * dev.cpu.0.cx_supported: C1/1 C3/96
> >
> >    MFC after: 2 weeks
> 
> If I remember correctly, ACPI spec directly specifies that there can
> be 
> several C-states with the same type but with different enter method
> and 
> exit latency. I have never seen any system with more then 3 C-states 
> yet, but technically I think that is possible. Type field defines 
> enter/exit semantics, respecting cache coherency and other things, so
> I 
> think there can be more then one state with, for example, C3
> semantics. 
> Latest CPUs support states C1, C3 and C5, while ACPI AFAIK defines
> only 
> three types and it may happen that both C3 and C5 have type-3
> semantics.
> 
> 

>From my read of the current ACPI specs, there isn't anything past C3.

However, Intel has definied Mwate Cstates that use the same nomenclature
and confuse what people think Cstates are.  Is this what you mean by
"C5"

sean