title: portaudio pa_devs report 0 device
body: <p>My system is ubuntu 15.10. I am very sure my audio works,</p>
  
  <pre><code>arecord -l
  
  **** List of CAPTURE Hardware Devices ****
  card 1: PCH [HDA Intel PCH], device 0: ALC887-VD Analog [ALC887-VD Analog]
    Subdevices: 1/1
    Subdevice #0: subdevice #0
  card 1: PCH [HDA Intel PCH], device 2: ALC887-VD Alt Analog [ALC887-VD Alt Analog]
    Subdevices: 1/1
    Subdevice #0: subdevice #0
  </code></pre>
  
  <p>but pa_devs, which is a official provided execuatble file in portaudio, reports 0 device as below,</p>
  
  <pre><code>PortAudio version number = 1899
  PortAudio version text = 'PortAudio V19-devel (built Jan 30 2016 19:22:45)'
  Number of devices = 0
  </code></pre>
  
  <p>And I can get devices number with pyAudio</p>
  
  <pre><code>import pyaudio
  
  pa = pyaudio.PyAudio()
  print(pa.get_default_input_device_info())
  print(pa.get_device_count())
  
  --- output ---
  
  {'defaultHighInputLatency': 0.034829931972789115, 'maxInputChannels': 32, 'defaultLowOutputLatency': 0.008707482993197279, 'defaultLowInputLatency': 0.008707482993197279, 'defaultSampleRate': 44100.0, 'hostApi': 0, 'structVersion': 2, 'maxOutputChannels': 32, 'defaultHighOutputLatency': 0.034829931972789115, 'name': 'default', 'index': 6}
  7
  </code></pre>
  
  <p>Should I install something or re-built portaudio with some special settings? Thanks!</p>