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Date: Thu, 26 Aug 2004 09:01:10 -0700
From: Nate Lawson <nate@root.org>
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To: Ulrich Spoerlein <q@uni.de>
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cc: acpi@freebsd.org
Subject: Re: Cx states not working on Dell Inspiron 8600 (Pentium M)
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Ulrich Spoerlein wrote:
> Hello,
> 
> I've been running CURRENT on this laptop since the gcc 3.4 import and
> the Cx states don't work (AFAICS).
> 
> dmesg, kernel config, DSDT and ASL can be obtained from
> http://www.galgenberg.net/~q/freebsd
> 
> No matter if I pull the AC-plug or not, I get this:
> hw.acpi.cpu.throttle_max: 8
> hw.acpi.cpu.throttle_state: 8
> hw.acpi.cpu.cx_supported: C1/1 C2/1 C3/85 C4/185
> hw.acpi.cpu.cx_lowest: C4
> hw.acpi.cpu.cx_usage: 0.00% 100.00% 0.00% 0.00%

You configured it correctly.  But states > C3 can't be entered if bus 
mastering is active.  Do you have a sound card playing or usb loaded? 
Try without both and see if you get more C3 or C4 usage.

-Nate