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

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Message-ID: <20100717012742.GA11262@srcf.ucam.org>
Date:	Sat, 17 Jul 2010 02:27:42 +0100
From:	Matthew Garrett <mjg59@...f.ucam.org>
To:	Henrique de Moraes Holschuh <hmh@....eng.br>
Cc:	Pedro Ribeiro <pedrib@...il.com>, 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 Fri, Jul 16, 2010 at 10:23:04PM -0300, Henrique de Moraes Holschuh wrote:

> I'm confused.  Is it the PCI reboot vector, or the ACPI reboot vector
> that acts instantly?  The bug reporters say that they use reboot=pci to
> have instant reboot, in this thread...

The PCI one, since it's a function of the chipset. The ACPI one would 
act instantly (it's the PCI one, in this case) but it's marked as 
unsupported. However, the PCI one is poorly standardised - Windows never 
uses it, different chips have subtly different requirements and so on.

-- 
Matthew Garrett | mjg59@...f.ucam.org
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