Update on this issue.
I could not find how to disable my onboard soundchip anywehere in my BIOS, but...more elegant I found...
this solution that solved the problem for me.Configuring default soundcards / stopping soundcards from switching
Note: This section assumes that you have installed each soundcard properly.
1)In the Konsole type
--> This will give the the name and index of each soundcard you have currently.
Make a note of the names, and decide which one you want to be the default card.
2)Now edit (with root privileges) /etc/modprobe.d/alsa-base
kdesu kwrite /etc/modprobe.d/alsa-base
At the end of the file, add the following (assuming you have 3 cards with module names A, B and C and you want to have them in the order CAB)
options snd-C index=0
options snd-A index=1
options snd-B index=2
(replace of course C, A and/or B woth the names you got in step 1)(this solution was originally found here )
Now everytime I start Pardus my preferred soundcard is loaded as default and visible in Kmix as selected device.