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[Raymond <1533902@xxxxxxxxxxxxxxxxxx>]

This mean that you need to use alsactl restore the channel mode control
before pulseaudio probe sound card

or

Add hook to change channel mode when surround51 is openned in hda-
intel.conf

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https://bugs.launchpad.net/bugs/1533902

Title:
  Surround don't work properly on Ubuntu 16.04 Xenial Xerus

Status in pulseaudio package in Ubuntu:
  Incomplete

Bug description:
  I use Ubuntu 16.04 Xenial Xerus (in development) and after of the
  updates to PulseAudio Some days ago the surround It stopped working...

  i've configured the  /etc/pulse/daemon.conf and alsamixer for surround
  and it worked until Some days ago, now i have that to configure
  manually every time that system logged

  In fact, Alsamixer indicates that the default card sound is pulseaudio
  and the system only transmits stereo sound, but when i configure for
  surround with the card sound intel, the surround it work.

  In the sound options ,the Surround settings do not appear even though
  I set it up in alsamixer. i've attached some screen..

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