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Having an issue with sound at the moment. I am trying to configure my 5.1 surround sound but it will only work on the Front left and Front right speakers. On the back of my motherboard I have 3x3.5mm jacks which I have connected the speakers to although these are not the right ports.

I want to "assign" the three ports on the back to each output (Sub and centre, Left and right, and rear left and right) although I'm not sure how to do this. My audio is ALC889 from Realtek and am using Ubuntu 12.04 with all updates installed.

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Did you select a correct channel mode for your card? Install pavucontrol, run it, and see the settings in the "Configuration" tab. The commandline way is running alsamixer in a terminal, select the right sound card and change the channel mode. Similar to most right mixer setting in this screenshot. –  gertvdijk Nov 16 '12 at 21:13

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Did you checked SurroundSound on Ubuntu documentation? This(The Simple Way to Get 5.1 Surround Sound Audio Working in Ubuntu) article might also help you.

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Sorry it seems you have misunderstood my question,I'm wanting to assign ports on my motherboard as I do in realtek audio manager in windows,when you plug a device in on windows,realtek audio manager will ask what you plugged in (eg plug in centre/sub to line in) and I can assign what to do with that port,I would like to do this but in ubuntu –  user107829 Nov 21 '12 at 20:34

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