Public bug reported:

Running Xubuntu Oneiric (11.10) on an Intel DH67BL mainboard, my Ubuntu
randomly disables the rear-output of my onboard-soundcard (Intel HDA
ALC892). Flickering the audio levels and mute-state of the Master
output, before turning mute.

I've found out, that it seems to be related to whether the front audio-
panel is enable in my BIOS or not.

When I enable the front-audio, the volume meters for "Headphone", "Front" and 
"Master" seem relate to the same output: Front.
This "mute-problem" seems to only affect the rear output. When I playback 
music, and cannot hear sound on my rear-output, the front-output is working 
fine.

Disabling the front-audio panel in my BIOS prevents triggering this
issue.

** Affects: alsa-driver (Ubuntu)
     Importance: Undecided
         Status: New

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https://bugs.launchpad.net/bugs/982635

Title:
  Playback working randomly with Intel ALC892

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