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Bug#626022: linux-2.6: Attempting to reboot on [U]EFI systems causes kernel hang

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

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