I believe Daniel Chen set this to WontFix prematurely.  This report
isn't "wahh, I don't like how pulseaudio works."  It's an actual bug.

When I set the volume with gnome's mixer applet or with pavucontrol, and
pulseaudio's level reaches 15%, then Alsa's "Master" channel reaches
zero.  Therefore, at all levels below 15%, there is no sound at all.
Alsa's PCM volume stays at 100% until pulse reaches 2% or so, and then
PCM finally drops to 0%.  Of course this has no effect, because Alsa's
Master has been silenced the entire time.  I'm guessing the intent is
that Master should stay at a small, nonzero volume, until pulse is
finally lowered to zero.

This is happening on a Dell M6400 with Intel HDA:
00:1b.0 Audio device: Intel Corporation 82801I (ICH9 Family) HD Audio 
Controller (rev 02)

I've attached a screenshot of puvacontrol and alsamixer side-by-side at
15% volume.

** Attachment added: "Screenshot showing Alsamixer reaches 0% while pavucontrol 
is still at 15%"
   
https://bugs.launchpad.net/ubuntu/+source/pulseaudio/+bug/533921/+attachment/1762565/+files/volume_15pct.png

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https://bugs.launchpad.net/bugs/533921

Title:
  [lucid regression] HDA: pulseaudio volume control sets alsa master to 0 when 
still at 15% (incorrect db data?)

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