White Noise or Blank Audio only ?

[b-ak]

Hi,

I'm trying to run this on my laptop. It is just one 4 conductor audio jack (just like the mobile phones).
I get white noise if I don't connect anything or absolutely nothing when I connect the cable.

I also see these errors on startup..

b-ak@Ideapad-330S:~/data/code-projects/euterpe$ ./euterpe 
ALSA lib pcm.c:2565:(snd_pcm_open_noupdate) Unknown PCM cards.pcm.rear
ALSA lib pcm.c:2565:(snd_pcm_open_noupdate) Unknown PCM cards.pcm.center_lfe
ALSA lib pcm.c:2565:(snd_pcm_open_noupdate) Unknown PCM cards.pcm.side
ALSA lib pcm_route.c:869:(find_matching_chmap) Found no matching channel map
ALSA lib pcm_route.c:869:(find_matching_chmap) Found no matching channel map
ALSA lib pcm_route.c:869:(find_matching_chmap) Found no matching channel map
ALSA lib pcm_route.c:869:(find_matching_chmap) Found no matching channel map
Audio Parameteres Initialized

My /etc/asound.conf looks like this..

pcm.!default {
        type hw
        card 0
}

ctl.!default {
        type hw           
        card 0
}

`

aplay -l returns..

**** List of PLAYBACK Hardware Devices ****
card 0: PCH [HDA Intel PCH], device 0: ALC236 Analog [ALC236 Analog]
  Subdevices: 0/1
  Subdevice #0: subdevice #0

arecord -l returns..

**** List of CAPTURE Hardware Devices ****
card 0: PCH [HDA Intel PCH], device 0: ALC236 Analog [ALC236 Analog]
  Subdevices: 0/1
  Subdevice #0: subdevice #0