Visit www.alsa-project.org and download the alsa rpms for
the onboard sound card. Install on your system and follow
the instructions on the alsa site.
You can download the rpm files for your version of redhat
from alsa-project site and then, do / check the following:
Add the following lines to /etc/modules.conf after installing
the rpm:
alias char-major-116 snd
alias snd-card-0 snd-intel8x0 (substitute with the Yamaha
snd name here)
alias char-major-14 soundcore
alias sound-slot-0 snd-card-0
alias sound-service-0-0 snd-mixer-oss
alias sound-service-0-1 snd-seq-oss
alias sound-service-0-3 snd-pcm-oss
alias sound-service-0-8 snd-seq-oss
alias sound-service-0-12 snd-pcm-oss
After that at # prompt, type following commands:
# amixer set Master 80% unmute
# amixer set PCM 80% unmute
# amixer set CD 80% unmute
# amixer set Headphone 80% unmute
Try playing a sound file. You can reboot and get into kde
and check out the sound in xmms, or wherever.