Comment # 27 on bug 1201418 from Takashi Iwai

It seems OK.  And I misunderstood alsa-info.sh output.  That's the expected
output.  So, it's not the cause of PulseAudio problem, as it seems.

In anyway, try to poke something manually, e.g. perform the following as normal
user:

% amixer -c1 set Headphone 50%
% amixer -c1 set Headphone unmute
% pasuspender -- aplay -Dplughw:1,0 -vv /usr/share/sounds/alsa/test.wav
% pasuspender -- aplay -Dplughw:1,1 -vv /usr/share/sounds/alsa/test.wav

I guess it's former, but let's see.

And you can adjust quite lots of knobs via "alsamixer -c1" (ESC to quit).