Re: no sound in headphones

[Liviu Andronic <landronimirc@gmail.com>]

On 9/20/09, Emanoil Kotsev <deloptes@yahoo.com> wrote:
> nothing is wrong - you may have many input/outputs. you have to figure out
>  which controls are for the headphones. Unfortunately it depends on your
>  card. Mostprobably you have to assign the correct output to your
>  application.
>
>  In alsamixer I see many headphone controls and if I plug into the headphone
>  jack it works fine
>
In the mixer (both alsa and xfce) I have only one  "Headphones" volume
control. Probably irrelevant, I also have "IEC958" switches and
"IEC958 Playback Source" options; no idea what these are for.

I am not familiar with JACK. I just tried starting it from qjackctl,
but JACK failed to start.


>  amixer | grep Head
>  Simple mixer control 'Headphone',0
>  Simple mixer control 'Headphone as Line Out',0
>  Simple mixer control 'Headphone',1
>
liviu@debian-liv:~$ amixer | grep Head
Simple mixer control 'Headphone',0

This is the relevant part from amixer:
Simple mixer control 'Headphone',0
  Capabilities: pvolume pswitch
  Playback channels: Front Left - Front Right
  Limits: Playback 0 - 64
  Mono:
  Front Left: Playback 60 [94%] [-3.00dB] [on]
  Front Right: Playback 60 [94%] [-3.00dB] [on]

As far as I can see here, the headphone levels are just fine. When
headphones are plugged, though, the audio is simply not switched to
these.


>  Also you can play with .asounrd
>
>  # from http://alsa.opensrc.org/index.php/Dmix
>  pcm.headset { # playback only on frontpanel headset
>   type route
>   slave.pcm dmixer
>   slave.channels 8
>   ttable.0.0 1 # headphones front L
>   ttable.1.1 1 # headphones front R
>  }
>
Before I try this one, would there be anything I could with the first two?
Thank you
Liviu