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Possible Duplicate:
2 channel sound when 5.1 is expected

I have been trying to get the Surround sound working on my laptop for a couple of hours now. I have the Acter TimelineX 4830T, and I have gotten everything working accept the speakers. It has a 5.1 surround system built in, but only the front left and right speaker work.

Any help would be appreciated.

And here is the ALSA Information:

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marked as duplicate by Takkat, RolandiXor, RobotHumans, Mitch, jokerdino Aug 23 '12 at 6:50

This question was marked as an exact duplicate of an existing question.

Have you tried with a 5.1 channel source? Eg movie DVD? – izx Jul 21 '12 at 21:44
Takkat, I just tried that. It enabled the 5.1 for HDMI, but it does not work for the onboard speakers. Sound only comes out if I have Analog Stereo Output selected as the profile – Colum Jul 21 '12 at 21:53

I also have a timeline 4830t. It only has 2 internal speaker, so it is not possible to get Dolby 5.1 sound. The advertised 5.1 Dolby is for HDMI output. Have you tried connecting it to your home theater? I have test internal speaker in Windows 7, and Ubuntu 12.04 and the preform the same.

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