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Bug#626022: marked as done (linux-2.6: Attempting to reboot on [U]EFI systems causes kernel hang)

Your message dated Sun, 23 Dec 2012 12:09:32 +0000
with message-id <1356264572.7055.127.camel@deadeye.wl.decadent.org.uk>
and subject line Re: linux-2.6: Attempting to reboot on [U]EFI systems causes kernel hang
has caused the Debian Bug report #626022,
regarding linux-2.6: Attempting to reboot on [U]EFI systems causes kernel hang
to be marked as done.

This means that you claim that the problem has been dealt with.
If this is not the case it is now your responsibility to reopen the
Bug report if necessary, and/or fix the problem forthwith.

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626022: http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=626022
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--- Begin Message ---
Package: linux-2.6
Version: attempting to reboot on UEFI systems causes kernel hang
Severity: important
Tags: upstream

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

As you can see this is on a P8P67 Motherboard.

It seems as if this has recently been reported at Ubuntu's Launchpad as well:

Which also suggests a workaround of adding reboot=a,w to the kernel command
line, I shall try this later on this evening.

-- System Information:
Debian Release: wheezy/sid
  APT prefers unstable
  APT policy: (500, 'unstable'), (1, 'experimental')
Architecture: amd64 (x86_64)

Kernel: Linux 2.6.38-2-amd64 (SMP w/4 CPU cores)
Locale: LANG=en_GB.utf8, LC_CTYPE=en_GB.utf8 (charmap=UTF-8)
Shell: /bin/sh linked to /bin/dash

--- End Message ---
--- Begin Message ---
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@redhat.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.


Ben Hutchings
One of the nice things about standards is that there are so many of them.

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