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Date: Sat, 11 Jan 2003 13:10:47 +0100 (CET)
From: Tobias Ringstrom <tori@ringstrom.mine.nu>
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To: Pavel Machek <pavel@ucw.cz>
cc: Marc Giger <gigerstyle@gmx.ch>, Stephen Rothwell <sfr@canb.auug.org.au>,
       Kernel Mailing List <linux-kernel@vger.kernel.org>,
       "Grover, Andrew" <andrew.grover@intel.com>
Subject: ACPI power off requires swsusp (was: Re: Power off a SMP Box)
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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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