[ubuntu] 5.1 audio problem

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http://ubuntuforums.org – Hello, I am using an Asus motherboard M2N68-AM PLUS. This motherboard supports 5.1 channel audio but there are only 3 pins at the back pannel and the channel output is selected by the drivers in windows for example when in windows I select 2.1 channel audio the pin configuration becomes Light Blue: Line-in Lime : Line out Pink : Mic in And for 6 channel the same pin configuration becomes Light Blue : Rear Speaker Out Lime : Front Speaker Out Pink : Bass & Centre This was for windows................... I'm unable to do that in Ubuntu as the sound preferences shows me only "Internal Analog Stereo output" So how do I get 5.1 channel output from this system?? (Hardware)