soundcard appearing as device, but not working

[tand read <tandread@otenet.gr>]

Dear Debian team,

I have a motherboard integrated sound card identified as

  lspci
    00:1f.3 Audio device: Intel Corporation Device a170 (rev 31)

Debian 8.2 (linux 3.16.0-4-amd64) seems to recognize it and
loads several sound modules:

  lsmod | grep snd | cut -f 1 -d' '
    snd_hda_codec_hdmi
    snd_hda_codec_realtek
    snd_hda_codec_generic
    snd_hda_intel
    snd_hda_controller
    snd_hda_codec
    snd_hwdep
    snd_pcm
    snd_timer
    snd
    soundcore

(but no alsa modules: lsmod | grep -i alsa shows nil and
 manually modprobe-ing them changes nothing)

and the sound system seems ok:

  cat /proc/asound/pcm
    00-00: ALC1150 Analog : ALC1150 Analog : playback 1 : capture 1
    00-01: ALC1150 Digital : ALC1150 Digital : playback 1
    00-02: ALC1150 Alt Analog : ALC1150 Alt Analog : capture 1
    00-03: HDMI 0 : HDMI 0 : playback 1

yet, nothing plays (analog output) and it is not a hardware
problem; the system is a dualboot one and in win10 it works
perfectly (sounding like “windows-have-the-correct-drivers”
and reporting itself as "Realtec High Definition Audio")

any idea if I can do anything about it? Any realistic
suggestion is welcomed and greatly appreciated

thanks for your time

tand read