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  From: Max Berger <mage@phobos.fachschaften.tu-muenchen.de>
  To  : <craigm@milkyway.gsfc.nasa.gov>
  Date: Mon, 13 Sep 1999 22:41:28 +0200 (MEST)

CPU Throttling (WAS:Re: Another CPU slows to a crawl after resumefrom suspend)

On Mon, 13 Sep 1999, Craig Markwardt wrote:
> to "resume" from standby.  [ However, as a side note, I am *very*
> interested in ways to actively control the CPU throttling.  Somehow I
> think this is very hardware dependent though. ]

I am sorry for misusing your mail for promoting our project :)

As far as I know (and I don't really do) the APM specs provide only small
support for CPU throttling: CPU can be off (sleeping, off, ...), half
speed or full speed.

ACPI defines a much greater quantity. For example, any modern board that
has ACPI can throttle the cpu in 1/8 steps, some even in 1/16 steps. (And
with ACPI this is NOT hardware dependent)

Unfortunately, I must admit, that we don't have anything usefull - yet.
Please stay tuned and look at our page.


Max Berger
e-mail: max.berger@phobos.fs.tum.de

-- ACPI4Linux project: http://phobos.fs.tum.de/acpi/
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