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Date:	Sun, 23 Dec 2012 12:59:50 -0800
From:	Jonathan Nieder <jrnieder@...il.com>
To:	stable@...r.kernel.org
Cc:	Matthew Garrett <mjg@...hat.com>, x86@...nel.org, hpa@...or.com,
	linux-kernel@...r.kernel.org, Keith Ward <keith@...os-realm.net>,
	Ben Hutchings <ben@...adent.org.uk>
Subject: [2.6.32.y, 2.6.34.y] Re: [PATCH] x86: Don't use the EFI reboot
 method by default

Hi Willy et al,

Please consider

  f70e957cda22 x86: Don't use the EFI reboot method by default,
               2011-07-06

for application to the 2.6.32.y and 2.6.34.y trees.  The patch was
applied upstream late in the 3.0 cycle, so newer kernels don't need
it.

In 2011, Keith Ward wrote[1]:

> When attempting to reboot my my UEFI enabled system, the system hangs when
> calling reboot requiring me to manually reset the system via the reset switch.
>
> Screenshot: http://twitgoo.com/29bq1c

Ben Hutchings writes[1]:

> Version: 3.0.0-1
>
> I also had this problem on my own system, but it is fixed now.
> I bisected the fix to:
>
> commit f70e957cda22d309c769805cbb932407a5232219
> Author: Matthew Garrett <mjg@...hat.com>
> Date:   Wed Jul 6 16:52:37 2011 -0400
>
>     x86: Don't use the EFI reboot method by default
>
> which is basically equivalent to the workaround!
>
> I'll also apply this fix to squeeze as it's so simple.

Keith Ward also wrote[1]:

> It seems as if this has recently been reported at Ubuntu's Launchpad as well:
> https://bugs.launchpad.net/ubuntu/+source/linux/+bug/721576

There are a variety of reports of the same panic at that bug on
2.6.32.y-, 2.6.38.y-, and 2.6.39-based kernels.  Passing "reboot=a,w"
on the kernel command line avoids trouble for reporters.

Regards,
Jonathan

[1] http://bugs.debian.org/626022
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