[ubuntu_studio] general sound problem

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http://ubuntuforums.org – Hi there, I'm running Ubuntu Studio 12.10 Strange things happen: 1. After login, playing mp3 or videos -> sound is ok. 2. Then I start Ardour, work with a project -> sound is ok 3. Then I exit Ardour, playing mp3 or videos -> NO SOUND!! (4.) Starting Ardour again -> sound still works This is reproducible with every boot. Any idea what to do? (Hardware)