The dkms works partially. Yes the headphone started to work but the
volume control behaves weird. I made a screen capture (see attachment)
to show what's wrong. In this video I change the volume by the volume
buttons on the keyboard. In a terminal window I have alsamixer running
to see how the volume controls are influenced by this. What you see
there is also what I hear: The volume decreases when the volume
notification bar (at the top right corner of the screen) decreases from
100% to approximately 60%. In that range the volume of the headphone
control descreases from 100% to 0%. Then from 60% to somewhere around 5%
in the notification bar, nothing happens. And when the notification bar
descreases from 5% to 0% then the PCM control decreases from 100% to 0%.

** Attachment added: "screen capture of volume controlls"
   
https://bugs.launchpad.net/ubuntu/+source/alsa-driver/+bug/876020/+attachment/2650085/+files/audio.ogv

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https://bugs.launchpad.net/bugs/876020

Title:
  [Thinkpad R61, 8932CTO, Conexant CX20549 (Venice), Green Headphone
  Out, Left] No sound at all

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