linux-kernel - Re: Disk spin down issue on shut down/suspend to disk

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Message-Id: <200708062125.26387.rjw@sisk.pl>
Date:	Mon, 6 Aug 2007 21:25:25 +0200
From:	"Rafael J. Wysocki" <rjw@...k.pl>
To:	Michael Sedkowski <sedmich@...il.com>
Cc:	Tejun Heo <htejun@...il.com>,
	Henrique de Moraes Holschuh <hmh@....eng.br>,
	linux-kernel@...r.kernel.org, linux-ide@...r.kernel.org,
	linux-acpi@...r.kernel.org
Subject: Re: Disk spin down issue on shut down/suspend to disk

On Monday, 6 August 2007 20:21, Michael Sedkowski wrote:
> Dnia 07-08-2007, Wt o godzinie 02:03 +0900, Tejun Heo napisał(a):
> > Rafael J. Wysocki wrote:
> > >>> Sidux is a Debian Unstable based distro with it's own set of patches
> > >>> including the shut down patch provided here:
> > >>> http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=426224
> > >> You'll probably have to ask Sidux what changes they made that could cause
> > >> the double spin down, even if halt(8) is never passed the -h flag.
> > > 
> > > Well, I've been observing the same behavior on nx6325 for some time and I
> > > use openSUSE 10.2.  I think this is kernel-related.
> > 
> > Hmmm... If the problem only shows up on nx6325, it might be that ACPI is
> > pulling unnecessary stunt.  Please apply the attached patch and report
> > when the disk spins down and up.
> > 
> > Thanks.
> > 
> 
> Disk spins down on "Pre-shutdown prepare" and then goes up and down on
> "Power down".

Same thing on my box.

In kernel_shutdown_prepare(SYSTEM_POWER_OFF) we call device_shutdown(), so it
looks like the drive is powered off by one driver's .shutdown() routine.

Greetings,
Rafael


-- 
"Premature optimization is the root of all evil." - Donald Knuth
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