[ubuntu] Sound Problem with HP dv6

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http://ubuntuforums.org – Hi All I have HP Pavilion dv6 1390ev entertainment , with win7 installed with it and working well I installed ubuntu 9.10 but have the following problem When I jacked in the headphone it works well , but it works beside the main speakers , so the headphone is useless I can't figure out how to solve this problem, I need to make the headphone works alone , not stereo beside the speakers. Thanks in advance. (Hardware)