linux-kernel - RE: what is the difference between shutdown command and writing to /sys/power/state

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Message-ID: <A3258B497F1C1441AD36A2E8B45FD628ACF82B@scsmsx412.amr.corp.intel.com>
Date:	Thu, 20 Sep 2007 11:11:38 -0700
From:	"Agarwal, Lomesh" <lomesh.agarwal@...el.com>
To:	"Rafael J. Wysocki" <rjw@...k.pl>
Cc:	<linux-kernel@...r.kernel.org>
Subject: RE: what is the difference between shutdown command and writing to /sys/power/state

Can someone tell me the flow of code for these two scenarios -
I write disk to /sys/power/state. How does system go to hibernation? How
does this trigger ACPI driver functions?
I issue shutdown command.
I am using 2.6.18 kernel.

Thanks,
Lomesh

-----Original Message-----
From: linux-kernel-owner@...r.kernel.org
[mailto:linux-kernel-owner@...r.kernel.org] On Behalf Of Rafael J.
Wysocki
Sent: Wednesday, September 19, 2007 5:09 PM
To: Agarwal, Lomesh
Cc: linux-kernel@...r.kernel.org
Subject: Re: what is the difference between shutdown command and writing
to /sys/power/state

On Wednesday, 19 September 2007 23:37, Agarwal, Lomesh wrote:
> Can you tell me the differences?
> Also what do you mean by - depending also on what you mean by 'now'? I

Please tell me what kernel version you're referring to.

> gave now as a time parameter to shutdown command. How can it be
> interpreted in a different way?

Sorry, I have misunderstood your post (the "now" doesn't look as a part
of the
command).

Greetings,
Rafael


> -----Original Message-----
> From: Rafael J. Wysocki [mailto:rjw@...k.pl] 
> Sent: Wednesday, September 19, 2007 2:35 PM
> To: Agarwal, Lomesh
> Cc: linux-kernel@...r.kernel.org
> Subject: Re: what is the difference between shutdown command and
writing
> to /sys/power/state
> 
> On Wednesday, 19 September 2007 20:50, Agarwal, Lomesh wrote:
> > Does linux handles writing "disk" to /sys/power/state and shutdown
-P
> > now differently (except writing to disk part)?
> 
> Yes, it does (depending also on what you mean by 'now').
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