i had this problem as well on a Sony Vaio VGN-BX560B.  This box has an
intel hda sound card.  I was able to get the laptop to turn off by
forcing he removed of the sound module.

I did this by adding the line

  rmmod snd-hda-intel

to /etc/default/halt

Hope this helps someone.

-- 
Power down after shutdown does not work...
https://bugs.launchpad.net/bugs/43961
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of a duplicate bug.

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