[ubuntu] laptop speakers and headphones, simultaneous sound

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http://ubuntuforums.org – Basically whenever i plug in headphones in 12.04 the sound plays through both speakers and headphones. Since release I have tried and failed to solve this issue many times. I know its not a problem with the headphones, and i know it's not a problem with the headphone jack, as using the same headphones on windows works as normal. I reeeeeeally want to get this fixed ASAP, it is driving me insane, This is the first release this problem has happened. I've posted this in several different sub-forums now and still had no luck... (Hardware)