[ubuntu] No sound from speakers but on headphone

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http://ubuntuforums.org – Greetings, I have installed Karmic as fresh install, yet, my laptop (LG LW70 Express) has only sound at headphones, when I unplug headphones or since start no headphones are plugged; it does not have any sounds... What can I do to fix this? (PS: Beside having constantly on headphones) (Hardware)