I've been working on this issue as well, and wanted to confirm that
mixer settings do not appear to be at fault, since with pulseaudio
stopped, audio works directly through alsa. Other systems with identical
configuration but different sound hardware (using intel_hda driver) do
work.

Here's the general test case we have been using:

# paplay /usr/share/sounds/alsa/Noise.wav 
-> NO SOUND

# aplay -D default /usr/share/sounds/alsa/Noise.wav
-> NO SOUND (through pulseaudio via alsa-pulseaudio plugin)

# aplay -D hw:0 /usr/share/sounds/alsa/Noise.wav
aplay: main:608: audio open error: Device or resource busy

# pkill pulseaudio
# aplay -D hw:0 /usr/share/sounds/alsa/Noise.wav
-> WORKS

No suspicious output or errors have been spotted in the debug logs from
pulseaudio. The commands run and complete just as though sound is being
played.

-- 
pulseaudio gives no audio output with snd_intel8x0
https://bugs.launchpad.net/bugs/557699
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