Ubuntu and surround sound

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http://askubuntu.com – im trying to connect my logitech x.530 to my dell studio 1558 and get 5.1 sound. I have 3 jaks and in windows i automaticly could switch between line in adn mic. Which means i could get 5.1 surround over these 3 jacks. Ubunut does not realise that one of the three jacks should be switched to give sound to the center and lfe speaker. Itried all the tips in the forums, but nothing works. i can only selct 4.0 sound in pulse audio. as the dell and the idt 92hd89e chip for the sound are probably famous laptops i thought there must be someone who has similar issues in the 5.1 sound. I would like to (HowTos)