Another report on this: I'm using an Intel DG43NB motherboard (Intel G43
Express chipset, AMI EFI 2.00) with a Celeron E3300 CPU. I'd previously
been booting in BIOS mode with no problems, but I tried UEFI mode for
Ubuntu 11.04. I had the kernel panic on reboot, but not on shutdown.
I've tried this with both the Ubuntu precompiled 2.6.38-8-generic kernel
and a locally-compiled 2.6.39 kernel from the source at
http://www.kernel.org, with the same results with both. Adding
"reboot=a,w" to my ELILO options (GRUB 2 is unreliable for me) fixes the
problem (although I've not yet tested shutdown). Adding "noefi" to the
boot options prevented the system from booting. Also and FWIW, I found a
Debian bug report that seems to be of the same problem:
http://lists.debian.org/debian-kernel/2011/05/msg00211.html

I took a photo, but it turned out illegibly blurry.

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https://bugs.launchpad.net/bugs/721576

Title:
  [natty] kernel panic on reboot with (U)EFI

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