Intel HDA / ALC662 analog surround problem

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Hi.

I'm using alsa 1.0.28 (lib and utils). Everything works fine so far, i.e.
stereo output through speakers and headphone as well as S/PDIF and all
possible capturing.

According to my mainboard manual, the codec supports 5.1 (analog) surround by
using the rear "line out" jack (for rear surround) and "mic" jack (for center
and sub) - which doesn't work. (I don't have even a clue what to do to
activate.)

My questions:

1) Does 5.1 analog surround work for the ALC662? If yes, how?

2) If not, is it a limitation of the kernel oder alsa?

HDA-Intel.conf says:

  HDA-Intel.pcm.surround51.0 cards.HDA-Intel.pcm.front.0

Does this mean that 5.1 surround is restricted to stereo in any case?

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