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

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Message-ID: <20100714152638.GA28513@elliptictech.com>
Date:	Wed, 14 Jul 2010 11:26:38 -0400
From:	Nick Bowler <nbowler@...iptictech.com>
To:	Matthew Garrett <mjg59@...f.ucam.org>
Cc:	Pedro Ribeiro <pedrib@...il.com>, eusou15@...oo.com,
	ibm-acpi-devel@...ts.sourceforge.net, linux-kernel@...r.kernel.org,
	toralf.foerster@....de
Subject: Re: [PATCH] Remove 9 second reboot delay on Lenovo T400/T500

On 15:36 Wed 14 Jul     , Matthew Garrett wrote:
> On Wed, Jul 14, 2010 at 03:33:08PM +0100, Pedro Ribeiro wrote:
> >  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.
[...]
> 1) Lenovo's firmware is broken and the 9-second delay is always going to 
> be there. In that case we should try to use the ACPI reboot vector 
> first.

While it may be true that the firmware is buggy, reboot=acpi does not
solve the problem; reboot=pci does.

-- 
Nick Bowler, Elliptic Technologies (http://www.elliptictech.com/)
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