Public bug reported:

When playing sound from an application that uses libao on Ubuntu 12.04
(for example, pianobar), it blocks any other sound-playing application
from playing audio (for example, Firefox on YouTube).  A little digging
showed that /etc/libao.conf sets default_driver=alsa, changing this to
default_driver=pulse makes simultaneous audio from multiple programs
work perfectly.

1) Ubuntu 12.04
2) libao-common 1.1.0-1ubuntu2
3) Expected audio to play from several apps simultaneously
4) Apps using libao block the sound card so that no one else can play sound

** Affects: libao (Ubuntu)
     Importance: Undecided
         Status: New

** Attachment added: "Output of lspci -vvv"
   
https://bugs.launchpad.net/bugs/1075479/+attachment/3425450/+files/lspci-vvv.out

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https://bugs.launchpad.net/bugs/1075479

Title:
  libao defaults to ALSA output, should probably use Pulseaudio

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