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I have an Acer 5738G with Ubuntu 12.04, I modified the configurations to have 5.1 sound. It works, but my problem is that only my laptop speakers are detected as speakers in sound settings, when I plug in my system audio jack, Ubuntu detects headphones and ones that only have 2.0 sound.

So how can I make Ubuntu detect my system jack as speakers?

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for 5.1 you must have hdmi or 3 color jacks . 5.1 cant work with only 1 jack . if you have hdmi you can use it hdmi-supported sound sytem or you can a translater hdmi to your cable

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In what shape or form did you modify your speakers? Did you internally upgrade your motherboard or did you add speakers around on the side of your laptop?

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