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I am running Ubuntu 11.04 on Acer Aspire One Model 722. The problem is that sound keep coming out from the internal speaker even after plugging the headphone in. Now, I am a beginner in the Ubuntu AND Linux world. I would appreciate every detailed help.

Running alsamixer I noticed that the Headphone Jack Sense doesn't exist at all. I'm wondering if there are interim steps that need to be taken.

Thank YOU!

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This issue has been resolved following the fixes on

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