I'm having the exact same problem. After I installed Opensuse 11 on Monday I had sound. I lost sound in Gnome and KDE 4.X. As I began to patch the system and install additional software. I noticed I lost sound Totem and then VLC in gnome. I could still get sound in KDE 4. Then after a few days I lost sound in KDE4 so I went into KDE3. After about a two days I lost sound there also. So far I have tried various things I've seen posted and I still haven't found anything that works. I can't wait to see what the bug is.
