I am really confused now... it looks like the kernel config file itself
is the cause of my woes.

I was given a slimmed down copy of the kernel config optimized for a
Thinkpad L520 to use when building the kernel to make it quicker, which
I started using after my previous comment on this ticket when I went
through the 'git bisect' process. I went through the whole thing without
any errors - it reported the broken commit being the one creating the
tag!

So I tested that config file generating on the latest/master from the
git repo, and it worked.

This was weird, since I'd tested these builds before with no success. So
I went back and used the config file for the stock kernel installed on
ubuntu (/boot/config-3.2.0-14-generic), and now any build I try is
broken.

I can only assume that there is something in the config file I was provided 
which enables something my laptop needs?
Being a configuration parameter it would explain why some builds worked and 
others didn't, it would depend on whatever kernel config I was booted into at 
the time (I was using 'cp /boot/config-`uname -r` .config' before to generate 
it for each compile).

So, how do I go about debugging the config file? I wouldn't know where
to start!

** Attachment added: "config-3.2.0-thinkpad520"
   
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/903558/+attachment/2721107/+files/config-3.2.0-thinkpad520

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https://bugs.launchpad.net/bugs/903558

Title:
  Unable to boot 12.04 without 'noapic' flag enabled in GRUB

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