Comment 14 for bug 1236965

Btw, before I forget about it: These names are missing characters in the end. It has probably been fixed in later kernels.

  name 'Speaker Surround Playback Volum'
  name 'Speaker Surround Playback Switc'

...it can cause these alsamixer controls not to be picked up by PulseAudio. Maybe it causes them not to show up in alsamixer either, but not sure about that.

However, having skimmed through your report, I'm a little worried about that you can't seem to get sound out of anything but the front speakers, is this correct? Your report only indicates which ones are silent and which ones aren't, not where each one comes out.

With all alsamixer controls at good values, this command should give you sound out of the speakers, one by one:

speaker-test -v -D plughw:PCH -t wav -c 6