For what it's worth, this is not an Ubuntu-specific issue. I just tried -20-rc7 vanilla and it fails as well. Here's a probably more helpful kern.log . I'll try to take the issue upstream ...
** Attachment added: "kern.log" http://librarian.launchpad.net/6150239/kern.log -- Fails to hibernate https://launchpad.net/bugs/81189 -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
