From: Andrew Morton <akpm@linux-foundation.org>
To: Stephen Rothwell <sfr@canb.auug.org.au>
Cc: Olaf Hering <olaf@aepfle.de>, linux-kernel@vger.kernel.org
Subject: Re: apm system does not power off anymore
Date: Sun, 14 Oct 2007 23:41:49 -0700 [thread overview]
Message-ID: <20071014234149.39a4f08a.akpm@linux-foundation.org> (raw)
In-Reply-To: <20071015163720.09630ee4.sfr@canb.auug.org.au>
On Mon, 15 Oct 2007 16:37:20 +1000 Stephen Rothwell <sfr@canb.auug.org.au> wrote:
> On Sun, 14 Oct 2007 23:23:16 -0700 Andrew Morton <akpm@linux-foundation.org> wrote:
> >
> > Also, it's bad that the operator has to provide some special boot command-line
> > option to make the machine work properly. Please consider this to be a
> > bug. Has it always needed apm=power-off?
>
> It has always been that way because the behaviour of APM on SMP is not
> defined. We discovered early that it will work (at least for powering
> off) for most SMP machines as long as the APM calls are done on CPU 0.
> However on an SMP machine that does not cope, very bad things happen -
> thus the operator has to explictly enable the power off behaviour on an
> SMP box. (On UP power off is enabled by default.)
hrm, OK.
But it could have been controlled by a more-user-friendly runtime knob, I
guess. Not that it's worth changing that now.
next prev parent reply other threads:[~2007-10-15 6:42 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
2007-10-12 12:54 apm system does not power off anymore Olaf Hering
2007-10-15 6:23 ` Andrew Morton
2007-10-15 6:37 ` Stephen Rothwell
2007-10-15 6:41 ` Andrew Morton [this message]
2007-10-17 14:49 ` Olaf Hering
2007-10-19 9:36 ` Olaf Hering
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