Comment 12 for bug 420578

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powerpanda (zveda2000-gmail) wrote : Re: Karmic: PCM volume (as seen in alsamixer) "stuck" at 100% with pulseaudio enabled

What worked for me was changing profile to Analog Surround 4.0 Output (or any other surround option) in sound preferences hardware tab. The surround tab in alsamixer controls the volume smoothly for me.