Raymond:  "for a notebook with internal 5.1 speakers ... it is rather
strange that it cannot provide external 5.1/7.1 with three/four jacks"

The user manual says it *can* do both

1)  internal 5.1 using the onboard speakers, or alternatively 
2)  external 7.1 output using the four 3.5mm jacks.  

But in fact I have not *tested* whether it can do #2 properly, i.e.
external 7.1 output, because until dotdeb#29 was installed, I could
never get all the #1 internal onboard speakers to work.

Are you seeing stuff in the alsa-info that make you think 7.1 is not
working?  (I have not tested that config remember.)

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https://bugs.launchpad.net/bugs/1236965

Title:
  pulseaudio does not recognize internal speakers [P180HMx, Realtek
  ALC892, Speaker, Internal] volume slider problem

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