I checked the soltek website & they only offer drivers for windows. I checked the motherboard's PDF manual and on page 13 it says:
1-4.6 AC97 Audio Codec on board
AC97 Audio Codec Realtek ALC850 on board
Supporting 8-channel display of PCM audio output
8 channel audio consists of Front-Out, Surround-Out, Center-Out,
Surround-Back-Out, MIC-In, Line-In, and Front-MIC-In for complete
surround sound effect
SPDIF In/Out connector integrated in Back Panel supported by
ALC850 for digital interface format input/out.
AC97 Audio Codec Driver enclosed in Support CD for users
installation.
I searched google for ALC850 and linux or ALSA and turned up very few hits. Of the hits that I did find, it is usually someone mentioning the ALC850 in passing or even confirming it does not work with linux.
I hope this helps.
James