From mboxrd@z Thu Jan  1 00:00:00 1970
From: Valdis.Kletnieks@vt.edu
Subject: Re: [PATCH v2.6.38-rc7] Revert "libata: ahci_start_engine compliant to AHCI spec"
Date: Mon, 16 May 2011 13:02:17 -0400
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References: <201105120025.34531.rjw@sisk.pl> <BANLkTimqxmbpP1-+HxhPQS-YoLTh=bHd1Q@mail.gmail.com> <201105132222.11582.rjw@sisk.pl> <201105132244.29605.rjw@sisk.pl> <20110514101807.GA23665@htj.dyndns.org>
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In-Reply-To: Your message of "Sat, 14 May 2011 12:28:04 +0200."
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To: Tejun Heo <tj@kernel.org>
Cc: Linus Torvalds <torvalds@linux-foundation.org>, Jeff Garzik <jgarzik@pobox.com>, Michael Leun <lkml20100708@newton.leun.net>, linux-ide@vger.kernel.org, Linux PM mailing list <linux-pm@lists.linux-foundation.org>, LKML <linux-kernel@vger.kernel.org>, "Rafael J. Wysocki" <rjw@sisk.pl>, Jian Peng <jipeng2005@gmail.com>

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On Sat, 14 May 2011 12:28:04 +0200, Tejun Heo said:
> This reverts commit 270dac35c26433d06a89150c51e75ca0181ca7e4.
> 
> The commits causes command timeouts on AC plug/unplug.  It isn't yet
> clear why.  As the commit was for a single rather obscure controller,
> revert the change for now.
> 
> The problem was reported and bisected by Gu Rui in bug#34692.
> 
>  https://bugzilla.kernel.org/show_bug.cgi?id=34692
> 
> Also, reported by Rafael and Michael in the following thread.
> 
>  http://thread.gmane.org/gmane.linux.kernel/1138771

This also fixes the issue I had with a 10-second pause on my Dell Latitude E6500
laptop at boot while detecting the CD/DVD drive.

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