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

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Date:	Fri, 16 Jul 2010 22:31:40 +0200
From:	Florian Mickler <florian@...kler.org>
To:	Jens Rutschmann 
	<public-Jens.Rutschmann-+wsBvAY55uc@...ne.gmane.org>
Cc:	Pedro Ribeiro 
	<public-pedrib-Re5JQEeQqe8AvxtiuMwx3w@...ne.gmane.org>,
	public-ibm-acpi-devel-5NWGOfrQmneRv+LV9MX5uipxlwaOVQ5f@...ne.gmane.org,
	public-eusou15-/E1597aS9LQAvxtiuMwx3w@...ne.gmane.org,
	public-linux-kernel-u79uwXL29TY76Z2rM5mHXA@...ne.gmane.org,
	public-mjg59-1xO5oi07KQx4cg9Nei1l7Q@...ne.gmane.org,
	public-toralf.foerster-Mmb7MZpHnFY@...ne.gmane.org
Subject: Re: [PATCH] Remove 9 second reboot delay on Lenovo T400/T500



On Fri, 16 Jul 2010 09:38:54 +0200
Jens Rutschmann <Jens.Rutschmann-+wsBvAY55uc@...lic.gmane.org> wrote:

> Am 14.07.2010 16:33 schrieb Pedro Ribeiro:
> > 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.
> 
> Hi,
> 
> I just want to add to this discussion that this problem also occurs on my T61 with only Linux installed on it.
> "reboot=pci" also removed the reboot delay here.
> 
> If you need some further information or want me to try some patches / old kernels I'd be glad to help.
> 
> Regards,
> Jens
> 
Hi!

Just a quick me too: I'm on Lenovo R61. reboot=pci gives instantaneous
reboot, reboot=acpi and default-reboot delays for 9 seconds...

Cheers,
Flo

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