cpu.cx usage no longer available?

[Kevin Oberman]

> Date: Wed, 2 May 2007 10:33:15 +1200
> From: Andrew Thompson <thompsa at freebsd.org>
> 
> On Tue, May 01, 2007 at 03:13:38PM -0700, Kevin Oberman wrote:
> > I just installed Hans Petter's new USB driver on my laptop and wanted to
> > see if it still prevented the system from dropping into deeper sleep
> > modes. In the past I was limited to C2 when USB was loaded.
> > 
> > Now I see only hw.acpi.cpu.cx_lowest. cx_usage and cx_supported seem to
> > be gone.
> > 
> > I am running on a Pentium-M CPU, single core.
> > 
> > Do I need to enable something to make these show up or is there another
> > way to get this information?
> 
> Its now a per-cpu setting, look at dev.cpu.0.cx_supported.

Ahh, yes. I knew this at one time, but I had forgotten it.

Looks like the man page is a bit out of date. If I get a few spare
minutes I'll try to submit a patch.

I am VERY pleased to see that Hans Petter's new USB drivers do allow the
system to drop into C3! It will require a bit more testing, but I hope
to be able to leave USB in my kernel without serious battery life
impact.

I have heard that the new USB drivers are unlikely to make it into V7.0
due to lack of testing. I really hope a few more people give it a whirl
and report back on the results, good or bad, so that the drivers can
either be fixed or added to current.
-- 
R. Kevin Oberman, Network Engineer
Energy Sciences Network (ESnet)
Ernest O. Lawrence Berkeley National Laboratory (Berkeley Lab)
E-mail: oberman at es.net			Phone: +1 510 486-8634
Key fingerprint:059B 2DDF 031C 9BA3 14A4  EADA 927D EBB3 987B 3751
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