Re: Save power at idle onTyan S2466N-MPX, athcool, etc.

[Erik Slagter <erik-KW7PGP3XNp7a5EbDDlwbIw@public.gmane.org>]

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On Fri, 2005-09-30 at 15:36 -0700, David Mathog wrote:

> Flushed with success from that I next tried athcool
> on a single processor (athlon-MP 2200+) Tyan 2466N-MPX
> using a 2.6.8.1 kernel.  No joy.  It claimed to have
> changed the bits it controls but this didn't do a thing
> to the idle CPU temperature.  Neither did turning those bits
> off, so it wasn't already in the low power state.
> 
> This gives a pretty good clue why:
> 
> %  modprobe processor
> %  cat /proc/acpi/processor/CPU0/info
> processor id:            0
> acpi id:                 0
> bus mastering control:   no
> power management:        no
> throttling control:      no
> limit interface:         no

We had a discussion about exactly this a few weeks ago.

It boils down to: the AMD768 chipset can do C1/C2/C3 but not out of the
box using ACPI. First because ACPI processor support did not support
multiprocessor, now it does, but the ACPI parameters of this motherboard
prevent C2/C3 from being used by ACPI processor support.

So, out of the box you have C1, using the amd76x_pm you also have C2 and
optionally C3 support (although that completely screws up my sata
controller).

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