title: Can't find audio devices and play audio with PyQt4.QtMultimedia and python2.7 on Ubuntu 14.04
body: <p>I installed PyQt4 on Ubuntu 14.04 via <a href="http://conda.pydata.org/docs/index.html" rel="nofollow">conda</a>.
  All the GUI library is working but no output devices are found, so I get no audio output,
  using PyQt4.QtMultimedia (or PyQt4.QtGui.QSound).</p>
  
  <p>A sample script describing the situation:</p>
  
  <pre><code>from PyQt4.QtMultimedia import QAudioDeviceInfo
  
  device_info = QAudioDeviceInfo.defaultOutputDevice()
  if device_info.isNull():
      print 'No output audio device found'  # always executed
  else:
      print device_info  # never executed
  </code></pre>
  
  <p>Finding an audio output device is obviously required to play audio with PyQt4 (as I've verified).</p>
  
  <p>In general, with my Ubuntu, I can listen audio and music, so is not and hardware problem.</p>
  
  <p>In Windows and OS X the same code do find an audio device.</p>
  
  <p>How could I solve this problem?</p>