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[ZeXx86 <1373661@xxxxxxxxxxxxxxxxxx>]

I have attached dmesg output and pulseaudio log directly from LiveCD.

To be more precise, it is able to play 5.1 correctly from all speakers.
But right after e.g. track is played pulseaudio change its profile to stereo on its own.
It should be visible in pulseaudio log.
Maybe because sound card is secondary, Nvidia HDMI is considered as primary by unknown reason.

It is easily reproducible.

** Attachment added: "PulseAudio verbose log"
   https://bugs.launchpad.net/ubuntu/+source/pulseaudio/+bug/1373661/+attachment/4244722/+files/pulseverbose.log

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https://bugs.launchpad.net/bugs/1373661

Title:
  PulseAudio settings are not loaded correctly after boot

Status in “pulseaudio” package in Ubuntu:
  New

Bug description:
  It seems that from time when PulseAudio is used in Ubuntu there is a
  problem with loading sound profiles.

  First from all, I intend to use 5.1 sound surround system.
  In my case there are only maybe 4 speaker playing, even that I see there is 5.1 profile configured.
  They are not muted.

  As temporarily fix I found it is enough, when I simply switch to
  different sound profile (for example 50) and then again to 51 - same
  one as previously configured. But after this re-switch, it just works
  as supposed.

  So it is clearly a bug, because it does not work after boot with same
  sound profile, but after switching to another and then back to 51
  analog surround, it is fixed.

  It is possible to change such profiles by pacmd command too.

  Tested sound card is Sound Blaster X-Fi Xtreme Audio.
  Running Ubuntu 14.04, but this bug is present there for years.

  Interestingly, there are two sound cards reported in my system.
  #0 is HDMI sound card from NVidia card.
  #1 is Sound Blaster card.

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