Firstly you need to know your hardware, google your computer manufacturers name & model number to find out exactly what audio hardware you have. ie: is you audio device onboard (a chip on the mother board) or a seperate card or do you have both. as far as I know alc889a is a model chipset for hda-intel .
Post the output of : cat /proc/asound/card0/codec#* | grep Codec : just copy & paste that command in a terminal & post the output in a reply here.
Also post the output of : aplay -l (lowercase L) & : aplay -L
Have you tried the following wiki : http://wiki.sabayonlinux.org/index.php? ... ound_Cards
Whilst your model chipset is not supported here I did read that it is closely related to the alc888 with only a slight loss of the more exotic functions of the alc889a.