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Message-ID: <20100715230825.GA31651@srcf.ucam.org> Date: Fri, 16 Jul 2010 00:08:25 +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 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 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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