[ubuntu] No sound coming through 2.1 speakers

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http://ubuntuforums.org – Hi i have just install Ubuntu 12.04 LTS 32bit on my computer but i am having a bit of problem with sound. The sound is coming through my internal laptop speakers but when i connect my 2.1 speakers or headphone to 3.5mm jack nothing can be hear on my 2.1 speakers. (Hardware)