Public bug reported:

This was triggered after the latest upgrade. I can play videos just
fine, but after I'm done with it, Audio stops. I've restarted alsa-utils
and disabled, then enabled sound in KControl but still no luck. I've
tried different audio/video players but there's just no sound. I can get
the audio back when I reboot, but then, after playing one video or song,
audio stops again and I have to reboot to get my audio back.

artsd:
ALSA lib pcm_dmix.c:864:(snd_pcm_dmix_open) unable to open slave
Error while initializing the sound driver:
device: default can't be opened for playback (Device or resource busy)

aplay -l:
**** List of PLAYBACK Hardware Devices ****
card 0: I82801DBICH4 [Intel 82801DB-ICH4], device 0: Intel ICH [Intel 
82801DB-ICH4]
  Subdevices: 0/1
  Subdevice #0: subdevice #0
card 0: I82801DBICH4 [Intel 82801DB-ICH4], device 4: Intel ICH - IEC958 [Intel 
82801DB-ICH4 - IEC958]
  Subdevices: 1/1
  Subdevice #0: subdevice #0

** Affects: alsa-driver (Ubuntu)
     Importance: Undecided
         Status: New

-- 
[Gutsy] ALSA lib pcm_dmix.c:864:(snd_pcm_dmix_open) unable to open slave
https://bugs.launchpad.net/bugs/150129
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