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

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Message-ID: <20100715225022.GA31377@srcf.ucam.org>
Date:	Thu, 15 Jul 2010 23:50:22 +0100
From:	Matthew Garrett <mjg59@...f.ucam.org>
To:	Henrique de Moraes Holschuh <hmh@....eng.br>
Cc:	Pedro Ribeiro <pedrib@...il.com>,
	ibm-acpi-devel@...ts.sourceforge.net, eusou15@...oo.com,
	linux-kernel@...r.kernel.org, toralf.foerster@....de
Subject: Re: [ibm-acpi-devel] [PATCH] Remove 9 second reboot delay on
	Lenovo T400/T500

On Thu, Jul 15, 2010 at 07:31:49PM -0300, Henrique de Moraes Holschuh wrote:

> Or maybe we should key into whatever OSI() the ACPI firmware asked, and try
> first whatever shutdown path the highest version of Windows asked for by the
> firmware would.

I've been tracing how Windows implements reboots (XP, Vista and 7). It 
appears to use the ACPI reboot vector, the keyboard controller, the ACPI 
reboot vector again, the keyboard controller again and then hangs. I'll 
try implementing equivalent behaviour in Linux and see whether it makes 
any difference.

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