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@hyperbole
I am almost certain it's "options snd-hda-intel model=ref" line.
IntelHDA cards are know for this. They are not detected properly and you need to explicitly tell snd-hda-intel module which version you have when the system boots up and loads the module (driver if you like).
I would suggest you try this :
1)Run "lspci -v" and note exact model of you Audio device and version if any, then look up appropriate name here http://www.mjmwired.net/kernel/Documentation/sound/alsa/HD-Audio-Models.txt
2) Backup /etc/modprobe.d/alsa-base.conf
3) Remove these two lines
options snd-pcsp index=-2
options snd-hda-intel model=ref
4) Add this line
options snd-hda-intel model=X
Where X is the name you found in step 1.
5) Save and reboot.
I initially suggested for you to try options snd-hda-intel model="laptop" as according to the list of options most of Conexant models support this.
Hope this helps.