Same problem here:

$ lspci  | grep -i audio
00:1b.0 Audio device: Intel Corporation 6 Series/C200 Series Chipset Family 
High Definition Audio Controller (rev 05)

$ cat /proc/asound/card0/codec* | grep Codec
Codec: Realtek ALC892

>From pulseaudio debug log I didn't have messages when problem occour,
and I still have problem also if daemon is stopped.

As other people when audio clicks, at the same time I see window
flickering with alsamixer,  volume applet and audio setting window.

In attachment, the alsa-info.sh output.
Tell me if you need extra info.

** Attachment added: "my alsa-info.sh output"
   
https://bugs.launchpad.net/ubuntu/+source/alsa-driver/+bug/1066062/+attachment/3429408/+files/alsa-info.txt.YHBHYFnDcU

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You received this bug notification because you are a member of Desktop
Packages, which is subscribed to alsa-driver in Ubuntu.
https://bugs.launchpad.net/bugs/1066062

Title:
  [quantal] Sound volume changes without user interaction

Status in “alsa-driver” package in Ubuntu:
  Confirmed

Bug description:
  
  I can listen to the sound but automatically the sound is getting increased 
and decreased spontaneously.

  Some times popping up some error, as I am new to this it's very
  difficult to troubleshoot. Some please advice on this.....

  What action should I need to take?  Mail ID is
  optimous.prim...@gmail.com.

To manage notifications about this bug go to:
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