"2014-01-29 Change the order of elements in the output select control.
This will reduce the number of relay switches. Change 'put' function to
call the oxygen_update_dac_routing() function. Otherwise multichannel
playback does not work. Also there is a new function to apply settings,
this prevents from duplicating the code. Signed-off-by: Roman Volkov
<v1...@mail.ru> Signed-off-by: Clemens Ladisch <clem...@ladisch.de>"

This is the cause of the problem, it seem that PulseAudio not recognize the 
Speaker output.
On Ubuntu 14.04 LTS PulseAudio set the output on "Speakers"
But on Ubuntu 14.10 + the output "Speakers" doesn't exist.

In alsamixer:
Ubuntu 14.04: Speakers, Headphone, Headphone FP
Ubuntu 14.10 → 16.04: Stereo Headphone, Stereo Headphone FP, Multichannel

If I manually set "Multichannel" in alsamixer, I can play sound, but PulseAudio 
show only "Analog headphone" (in Pavucontrol), so the output persist on "Stereo 
Headphone FP" and no sound is played on the speakers. (And the output 
Multichannel is not set by default)
Thank you,
Valentin Crône

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https://bugs.launchpad.net/bugs/1551385

Title:
  No sound on ASUS Xonar DGX Soundcard (16.04)

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