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Date: Wed, 14 Jul 2010 15:46:46 +0100
Message-ID: <AANLkTikHjd3SZKCdTABO7Aw_Y1BMC2EYJTvLD83Ta34r@mail.gmail.com>
Subject: Re: [PATCH] Remove 9 second reboot delay on Lenovo T400/T500
From: Pedro Ribeiro <pedrib@gmail.com>
To: Matthew Garrett <mjg59@srcf.ucam.org>
Cc: ibm-acpi-devel@lists.sourceforge.net, linux-kernel@vger.kernel.org,
        toralf.foerster@gmx.de
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On 14 July 2010 15:36, Matthew Garrett <mjg59@srcf.ucam.org> wrote:
> On Wed, Jul 14, 2010 at 03:33:08PM +0100, Pedro Ribeiro wrote:
>> ?Please consider this patch. Let me know if you would like me to change
>> ?anything or if you don't agree with it. It applies cleanly to 2.6.35-rc5.
>>
>> ?The Lenovo T400 and T500 have an annoying 9 second delay when
>> ?rebooting, unless reboot=pci is passed to the kernel command line.
>> ?This delay happens from at least kernel 2.6.20.
>>
>> ?Make this change permanent by hardcoding the Tx00 on the
>> ?arch/kernel/reboot.c pci quirks table.
>
> There's two possibilities here:
>
> 1) Lenovo's firmware is broken and the 9-second delay is always going to
> be there. In that case we should try to use the ACPI reboot vector
> first.
>
> 2) We're doing something wrong in our shutdown sequence which then
> triggers this problem as a result.
>
> Either way, I think this patch is wrong.
>
> --
> Matthew Garrett | mjg59@srcf.ucam.org
>

Hi Matthew,

by acpi reboot vector you mean using reboot=acpi?
I tried it and does not solve the problem.
Check here http://marc.info/?l=linux-kernel&m=127590255224570&w=2

Can you please tell me how to debug this?

Thanks,
Pedro
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