So getting to this seems pretty hard. I think we're going to need a
startup/shutdown expert to fix this the right way.

Here is what *should* happen, in that order:

#1) PulseAudio plays the log-out sound, if any
#2) All applications accessing PA should quit
#3) PA should store current volume, then quit
#4) alsa-utils should mute the card to prepare for shutdown

#1 and #2 can go in parallel.

What we know so far is that #4 happens before #3 and probably before #2 as 
well, and #1 does not happen at all ( see bug #214370 ). We should probably try 
to delay #4 rather than killing PA earlier, to prevent us from making it harder 
to fix #1. 
Perhaps we should also prevent PA from autospawning if the runlevel is 0 or 6.

-- 
[Maverick] Sound is always muted on startup; unmuting makes the volume at 
lowest level
https://bugs.launchpad.net/bugs/592016
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