ACPI power off requires swsusp (was: Re: Power off a SMP Box)

From: Tobias Ringstrom (tori@ringstrom.mine.nu)
Date: Sat Jan 11 2003 - 07:10:47 EST


On Tue, 7 Jan 2003, Pavel Machek wrote:

> > > You could try ACPI in (very) recent kernels.
> >
> > You mean a 2.5.x kernel? Any Kernel with the newest ACPI patches has never powered off any of my machines:-(
> > Perhaps I don't know something...
> > I will try it now again...
>
> You can also get new ACPI for 2.4.X (at acpi.sf.net) and even ACPI in
> marcelo's kernel should be good enough for poweroff.

I just disovered that in 2.5.56 (at least), ACPI power-off needs
CONFIG_ACPI_SLEEP which depends on CONFIG_SOFTWARE_SUSPEND. This means
that without selecting software suspend, your machine cannot power off
using ACPI. Why is it so?

/Tobias

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