[lubuntu] Soundproblem on Lubuntu 12.10

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http://ubuntuforums.org – Having some sound problems with my Samsung N120 Netbook. I'm using the new Lubuntu 12.10. If I e.g. play a youtube video the sound is on, but if I try to play another one, there is no sound at all. Same problem with other "sound sources" like mp3. The only thing I can do, is to boot the machine :( (Hardware)