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Subject: Re: C2/C3 on SMP [Was: Re: 2.6.X not recognizing second CPU]
From: Erik Slagter <erik@slagter.name>
To: Dominik Brodowski <linux@dominikbrodowski.net>
Cc: linux-kernel@vger.kernel.org, Jim serio <jseriousenet@gmail.com>,
       Andrew Haninger <ahaning@gmail.com>
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Date: Wed, 29 Jun 2005 09:40:45 +0200
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On Tue, 2005-06-28 at 23:29 +0200, Dominik Brodowski wrote:
> On Tue, Jun 28, 2005 at 01:32:59PM +0200, Erik Slagter wrote:
> > On Mon, 2005-06-27 at 23:42 +0200, Dominik Brodowski wrote:
> > > a) Power Management is available on SMP, though support for it is a bit less
> > >    wide-spread than it is for UP
> > 
> > Still no C2/C3 handling :-(
> 
> Uh, wasn't there a small, nice patch implementing this in bk-acpi a few 
> weeks ago?
> *clicketyclick* Oh yes,
> http://bugzilla.kernel.org/show_bug.cgi?id=4401
> states it was merged into bk-acpi-test on 2005-04-22. However, I can't find
> it in current -mm any more...

You're probably talking about the amd768 module. I could use it, but I
never got it working correctly, there is no actual power reduction. It
may have to do with the fast (1000 Hz) 2.6 clock though, making it sleep
in C2/C3 for only very short intervals. Also the selection for idle
CPU's seems to be too simple.