linux-kernel - Re: [PATCH] Remove 9 second reboot delay on Lenovo T400/T500

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Date:	Wed, 14 Jul 2010 15:46:46 +0100
From:	Pedro Ribeiro <pedrib@...il.com>
To:	Matthew Garrett <mjg59@...f.ucam.org>
Cc:	ibm-acpi-devel@...ts.sourceforge.net, linux-kernel@...r.kernel.org,
	toralf.foerster@....de
Subject: Re: [PATCH] Remove 9 second reboot delay on Lenovo T400/T500

On 14 July 2010 15:36, Matthew Garrett <mjg59@...f.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@...f.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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