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

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Date:	Tue, 07 Aug 2007 16:45:25 +0200
From:	Thomas Renninger <trenn@...e.de>
To:	Tejun Heo <htejun@...il.com>
Cc:	Robert Hancock <hancockr@...w.ca>,
	Michael Sedkowski <sedmich@...il.com>,
	"Rafael J. Wysocki" <rjw@...k.pl>,
	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 Tue, 2007-08-07 at 15:41 +0900, Tejun Heo wrote:
> Robert Hancock wrote:
> > Tejun Heo wrote:
> >> Michael Sedkowski wrote:
> >>>> 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.
> >>> Disk spins down on "Pre-shutdown prepare" and then goes up and down on
> >>> "Power down".
> >>
> >> Oh... crap, so acpi wants to sync cache on shutdown.  I wonder whether
> >> it spins down the disk correctly.  Does emergency unload count increase
> >> after each power down?  Also, please post the result of 'dmidecode'.
> > 
> > I know that my Compaq X1000-series laptop does do some kind of ACPI
> > games with the disk on ACPI power off (I assume it is putting the disk
> > in standby before power-off at least). It also does this if you boot
> > into DOS, GRUB, etc. and then hit the power button. Could be if the disk
> > is dumb enough to spin up for sync cache and standby when there is
> > nothing to flush, and the kernel does its own standby, this could cause
> > an extra spinup/down..
> 
> Yeah, that seems to be what's going on.  I don't think we have any other
> choice than blacklisting those notebooks.  This is a mess.  How does the
> other OS cope with this?
> 
> I'm thinking about using DMI vendor/product match to detect the affected
> systems but I think it would be better to match the ACPI implementation
> directly.  Is there a way to match specific ACPI implementation?

I opened a new bug to collect dmi and acpidump outputs:
http://bugzilla.kernel.org/show_bug.cgi?id=8855
Thought this is the easiest way to get this all a bit together.

Would be great if you tell all affected people and let them attach
dmidecode and acpidump output there...

Thanks,

    Thomas

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