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

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Date:	Tue, 7 Aug 2007 22:09:10 +0200
From:	"Maciej Rutecki" <maciej.rutecki@...il.com>
To:	"Michael Sedkowski" <sedmich@...il.com>
Cc:	trenn@...e.de, "Tejun Heo" <htejun@...il.com>,
	"Robert Hancock" <hancockr@...w.ca>,
	"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

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.

The same laptop, bios, Debian etc.

-- 
Maciej Rutecki
http://www.maciek.unixy.pl
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