I have a similar issue.

However there is a difference of ALSA behaviour between the super user (
the account created during installation) and a subsequent one.

As the first user,

$ aplay -l
**** List of PLAYBACK Hardware Devices ****
card 0: SI7012 [SiS SI7012], device 0: Intel ICH [SiS SI7012]
  Subdevices: 1/1
  Subdevice #0: subdevice #0

As a subsequent user,

$ aplay -l
aplay: device_list:222: no soundcards found...

Infact during the same X login as the second user, I sudo to the first
user account and can play the sound. Looks like some ALSA configuration
issue.

There is no difference in "lspci -vv" between the two accounts.

-- 
/dev/dsp busy, but no program using it
https://launchpad.net/bugs/76876

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