Re: problem with cpu eating too much power, prize given if solved

Pavel Machek
2004-06-30T19:37:39Z

Hi!

> > Please refer to http://acpi.sourceforge.net/documentation/sleep.html
> > and ACPI spec 2.0a around Page 216
> >
> > "Sleep States
> > S1 - "Stopgrant"
> > Power to cpu is maintained, but no instructions are executed.
> > The CPU halts itself and may shut down many of its internal
> > components. In Microsoft Windows, the "Standby" command
> > is associated with this state by default.
> > "
>
> Well, I think what I want is S2, from the same document:
>
> S2
>
> While defined in the spec, this state is not currently in use. It
> resembles S3 with the qualification that some devices are permitted to
> remain on.
...

> I would like the CPU to power down, save things in memory, and then
> still have the screen and associated hardware on, and possibly also the
> keyboard and mouse if that is needed to capture an ACPI event, including
> the actual keystroke. This seems to be S2. I am not sure if all of S2
> needs to be implemented to do what I asked for, I just would like the
> functionality I described.

Unfortunately, your machine does not support S2. Actually, I do not
know any machine that does.

> > So again, which (mainboard/notebook) HW does depower the CPU and keeps the
> > rest running ?
>
> I thought this was something that most mainboards would support, given
> that we make the appropiate SW in the kernel.
>
> Another thing is that if a mainboard/BIOS supports ACPI, then it should
> actually support all of ACPI, including S2 support. Or am I wrong?

You are wrong at this. It is completely okay to support ACPI but no
sleep states at all (for example).
Pavel
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