Hi, I have a bug with exactly the same symptoms.
I'm also running Ubuntu 12.04, some of the specs:

Uname: Linux 3.2.0-24-generic x86_64
Package: linux-image-3.2.0-24-generic 3.2.0-24.39
Apport version: 2.0.1-0ubuntu8
ALSA version:  1.0.25
CUPS version: libcups2:i386 1.5.3-0ubuntu1
Proprietary modules: fglrx-amdcccle 2:8.960-0ubuntu1 (AMD Catalyst)

Hardware:
m/b: ASRock G41M-S3
cpu: Intel Q9650 @2.83Ghz x4
graphics: Radeon HD 4870
usb peripherals: Canon MX 330 printer/scanner (installed w/ cups), wired 
keyboard, mouse, logitech mic
audio: Logitech S-220 2.1 speakers

I haven't tried the 3.4 Kernel yet, but will do when I get the chance.

If anyone has any thoughts or breakthroughs - much appreciated,
Thanks in advance.

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https://bugs.launchpad.net/bugs/1002382

Title:
  Ubuntu 12.04 hangs on shutdown

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