linux-kernel - Re: ThinkPad T400 : should kernel option "reboot=pci" be hard coded ?

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Message-ID: <AANLkTimkWN5tU88J-M3Q4aq9pq-WljyyPAUPfnf9cuhf@mail.gmail.com>
Date:	Wed, 14 Jul 2010 06:01:28 +0100
From:	Pedro Ribeiro <pedrib@...il.com>
To:	Toralf Förster <toralf.foerster@....de>
Cc:	Matthew Garrett <mjg59@...f.ucam.org>,
	ibm-acpi-devel@...ts.sourceforge.net, linux-kernel@...r.kernel.org
Subject: Re: ThinkPad T400 : should kernel option "reboot=pci" be hard coded ?

2010/6/9 Toralf Förster <toralf.foerster@....de>:
> Hi,
>
> Matthew Garrett wrote at 16:11:03
>> On Mon, Jun 07, 2010 at 11:22:21AM +0200, Toralf Förster wrote:
>> > Since some kernel version (IIRC since 2.6.31) it is necessary to boot the
>> > linux kernel with that option to prevent an extra 9 seconds delay during
>> > reboot.
>> > I found this tip on the LKML -and now I'm wondering whether this option
>> > should be hard coded in the kernel sources b/c it seems to be necessary
>> > for current kernels too.
>>
>> No, the best thing to do would be to figure out what changed to require
>> the extra 9 seconds. Are you able to work out which the last kernel
>> release without this timeout was?
> The delay exists since 2.6.27, versions before them I can't test due to
> udev-149 which don't work together with version < 2.6.27.
>
> Since version 2.6.29 that kernel boot parameter avoids the extra delay, 2.6.28
> needs the 9 sec pause independend from what I specify during boot.
>
> --
> MfG/Kind regards
> Toralf Förster
>
> pgp finger print: 7B1A 07F4 EC82 0F90 D4C2 8936 872A E508 7DB6 9DA3
>
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I also have a T400, and reboot=pci solves the problem for me.

Just tested with kernel 2.6.20 and the 9 second boot delay is still
there. Maybe this should be hardcoded...

Regards,
Pedro
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