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the ubuntu folks have said to append model=lenovo-ms7195-dig to the sound options statement. when i tried this, the speakers began to squeal and the system locked up. [/b]
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Before I forget, some common sense (in case you did not check this).
I don't know about the lockup, but back off from 100% in your volume. You have it on 100%. Don't do that. That is WAY too high, and will lead to distortion.
Also, note if your microphone is active, you could get feedback causing the very squealing you are referring to. MAKE CERTAIN that is not what you are experiencing.