linux-kernel - Re: Loud "pop" coming from hard drive on reboot

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Date:	Wed, 18 Apr 2007 23:22:20 +0200
From:	Bartlomiej Zolnierkiewicz <bzolnier@...il.com>
To:	Chuck Ebbert <cebbert@...hat.com>
Cc:	Mark Lord <liml@....ca>, Stephen.Clark@...lark.us,
	Tejun Heo <htejun@...il.com>,
	Alan Cox <alan@...rguk.ukuu.org.uk>, 7eggert@....de,
	emisca <emisca.ml@...il.com>,
	Jan Engelhardt <jengelh@...ux01.gwdg.de>,
	linux-kernel <linux-kernel@...r.kernel.org>,
	linux-ide@...r.kernel.org, Adrian Bunk <bunk@...sta.de>,
	Andrew Morton <akpm@...l.org>
Subject: Re: Loud "pop" coming from hard drive on reboot


On Wednesday 18 April 2007, Chuck Ebbert wrote:
> Mark Lord wrote:
> > Mark Lord wrote:
> >>
> >> With the patch applied, I don't see *any* new activity in those
> >> S.M.A.R.T.
> >> attributes over multiple hibernates (Linux "suspend-to-disk").
> > 
> > Scratch that -- operator failure.  ;)
> > The patch makes no difference over hibernates in the SMART logs.
> > 
> > It's still logging extra Power-Off_Retract_Count pegs,
> > which it DID NOT USED TO DO not so long ago.
> > 
> 
> Just to add to the fun, my problems are happening with the "old"
> IDE drivers...

The issue you are experiencing results in the same problem (disk doing
power off retract) but it has a totally different root cause - your notebook
loses power on reboot.  It is actually a hardware problem and as you have
reported the same problem is present when using "the other" OS.

I think that the issue needs to be fixed (by detecting affected notebook(s)
using DMI?) in Linux PM handling and not in IDE subsystem because:

* there may be some other hardware devices affected by the power loss
  (== they require shutdown sequence)

* the same problem will bite if somebody decides to use libata (FC7?)

Bart
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