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

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Message-Id: <200708072241.24091.rjw@sisk.pl>
Date:	Tue, 7 Aug 2007 22:41:23 +0200
From:	"Rafael J. Wysocki" <rjw@...k.pl>
To:	"Maciej Rutecki" <maciej.rutecki@...il.com>
Cc:	"Michael Sedkowski" <sedmich@...il.com>, trenn@...e.de,
	"Tejun Heo" <htejun@...il.com>,
	"Robert Hancock" <hancockr@...w.ca>,
	"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 Tuesday, 7 August 2007 22:33, Rafael J. Wysocki wrote:
> On Tuesday, 7 August 2007 22:09, Maciej Rutecki wrote:
> > 2007/8/7, Michael Sedkowski <sedmich@...il.com>:
> > > I did some additional checking today...
> > > On kernels prior to 2.6.22 line, the bug exists and manifests itself
> > > exactly the same way. However, when I removed the "-h" flag
> > > from /etc/init.d/halt, the drive spins down only once on "Power down"
> > > message and there is no sign of the bug and the emergency unload count
> > > remains constant. I've verified this on kernels 2.6.21.6; 2.6.20.4;
> > > 2.6.18-4-686-Etch.
> > > The obvious conclusion is that something must have changed it the 2.6.22
> > > kernels, so that removing the "-h" has no effect.
> > > I dunno if my observations are of any value, but I thought You should
> > > know...
> > 
> > I confirm this. First 2.6.21-rcx works OK (if I remember).  In
> > 2.6.22(.1) remove -h option doesn't help - only warning message
> > dissapear, and double spin down also exists in suspend to disk.
> 
> Well, on my box (nx6325) with the appended (experimental) patch applied
> on top of 2.6.23-rc1 with the patchset from

s/2.6.23-rc1/2.6.23-rc2/
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