Topic: Libre audio codec?
At summer 2016 when I was on nonfree Linux Mint it needs nonfree AlsaFirmware to make use of an audio playback, however in GNU/Linux-libre systems like Parabola, PureOS, Devuan (w/o contrib or nonfree), Trisquel, FreeNIX, Hyperbola my machine never voices w/o a knowledge what's a libre replacement to nonfree AlsaFirmware for that audio card as coded below. 
root@darkstar:~# lspci -nnkv|grep -ie audio -ie sound -ie snd -ie music -ie jack
00:1b.0 Audio device [0403]: Intel Corporation 6 Series/C200 Series Chipset Family High Definition Audio Controller [8086:1c20] (rev 04)
Subsystem: Samsung Electronics Co Ltd 6 Series/C200 Series Chipset Family High Definition Audio Controller [144d:c604]
Kernel driver in use: snd_hda_intel
Kernel modules: snd_hda_intel
root@darkstar:~#