sound at starting but no sound thereafter

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http://forums.opensuse.org – Hi. I just installed opensuse 11.2 64 bits KDE 4. Everything went well except for sound. The starting and end sound of opensuse (default sound) can be heard throught he speakers. However if I try to play music or flash player, I will get no sound. Kmixer did not show any channel muted. And the card is recognized (XonarD2). Any ideas to overcome this? It worked well in ubuntu, so there should be a solution to get it working in opensuse. Help, please! (Distributions)