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["Joachim R." <joachim.e.rousseau+launchpad@xxxxxxxxx>]

CMI8738 is not well-supported by alsa.

Running with a center channel volume issue (center volume constant,
whatever the master volume).

I found out that master volume worked only for front/rear channel, not
center which stick to its initial value.

Pulseaudio volume for separate channel are not effectless.

amixer set no gauge for center/lfe, hence impossible to change it.

Seems that with this chip, when in 5.1 mic is not available and Mic-in
and center/lfe is on the same control.

I don't know if alsa is wrong or if CMI8738 is just a crap.

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https://bugs.launchpad.net/bugs/104617

Title:
  CMI8738 5.1 center speaker is mute

Status in alsa-utils package in Ubuntu:
  Invalid

Bug description:
  Binary package hint: gnome-media

  I've spent the past couple of days researching this on the internet. 
  I have a soundcard with the CMI8738 chipset, on  a desktop running Ubuntu Edgy.
  In 5.1 mode all works, except the center-speaker (the subwoofer works, but not the center speaker)

  I can't see a separate control for the center speaker, only for Master
  and PCM.

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