There was a report a couple of years ago, that ALSA and KDE did not play well together. For some obscure reason ALSA commandeered the system sound and would not let go. I may sound like a bit of an evangelist, but, so far in my maybe limited experience Mandriva 2006, gives the least setup headaches. My machine is an older Athlon at 1.6Gb\256Mb DDR\using onboard sound and video, all works fine on my standard install of 2006.Okay, one sound channel on my m\b is broken, big deal, it is a server, not a game machine or entertainer. The same install also works like a charm on my Acer 3000 laptop with SIS graphics, dual boots with XP OEM.
Give Mandriva 2006 a try.