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I installed ubuntu 12.04 and everything was fine and working. Recently when I start my computer the sound controller in top bar is not working. If I click on volume control icon on top bar it doesn't show the volume scale and stuff. Speakers are not working at all. But headphone is working fine. I'm using Acer aspire 5741 laptop. Please help me to solve the problem.

P.S. I don't know any relationship of this. But this problem occurs after installing Wine.

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in system notification area, sound indicator always shows it's muted. –  Malaka Nov 3 '12 at 4:19
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