Sorry can't help anyfurther but you might want to read this, someone has solved the problem. He found out that the sound card is conflicting with onboard modem. By disabling the modem in bios, the sound card works.
http://www.linuxquestions.org/questions/history/233044

And this how the soundcard is set in redhat:
http://www.brandonhutchinson.com/VIA...Hat_Linux.html

Good luck, let us know if it works.