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

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Message-ID: <AANLkTimn4vX72nE8oOKaQ-tfTFIquzrbvhWD3ANkg2p6@mail.gmail.com>
Date:	Fri, 16 Jul 2010 12:02:23 +0100
From:	Pedro Ribeiro <pedrib@...il.com>
To:	Matthew Garrett <mjg59@...f.ucam.org>
Cc:	Henrique de Moraes Holschuh <hmh@....eng.br>, eusou15@...oo.com,
	linux-kernel@...r.kernel.org, toralf.foerster@....de,
	ibm-acpi-devel@...ts.sourceforge.net
Subject: Re: [ibm-acpi-devel] [PATCH] Remove 9 second reboot delay on Lenovo 
	T400/T500

On 16 July 2010 00:08, Matthew Garrett <mjg59@...f.ucam.org> wrote:
> On Thu, Jul 15, 2010 at 08:00:23PM -0300, Henrique de Moraes Holschuh wrote:
>
>> Do you want to escalate this to Lenovo?  I need a clear and consise
>> description of the problem and the boxes we know to be affected.
>
> Well, right now we're not doing precisely what Windows does. The other
> possibility is that when the keyboard controller write triggers some SMM
> code, it makes an assumption about some piece of hardware state that
> isn't true and loops for a while to see if it changes. If we knew what
> that was then we could ensure that we're performing the same state
> change on our way down to reboot.
>
> One thing that would be worth checking is whether performing the
> keyboard controller writes from userspace with a minimal kernel and
> init=/bin/bash shows the 9-second pause or not - and then, ideally, see
> whether the same is also true under DOS.
>
> --
> Matthew Garrett | mjg59@...f.ucam.org
>

I'm available to try and test whatever you want on my machine .

Regards,
Pedro
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