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I have two computers that I want to have coming through the same speakers, I bought a cable, which I connected from the headphone jack on the one computer to the line-in jack on the other.

I know sound is coming out of the headphone jack (confirmed by using headphones). But when I plug the cord into the line-in, I can't get it to output the signal that's coming in on line-in.

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Reset to default
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You may be able to redirect the line-in to your sound card output by using gnome-alsamixer (sudo apt-get install gnome-alsamixer in case you don't have it).

Just enable the Line option and you should get the input sound redirected to your sound card's output.

I kind of have the same problem, but instead of redirecting to the sound card's output, I'd like to redirect to my USB headphone's output (which contains a separate sound card).

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    Whoohoo! That did it. Not sure why the gnome mixer worked when the others didn't, but thanks!
    – David Oneill
    Feb 13, 2012 at 17:42
  • Works nice. I'm starting to give up on the sound settings app. All sound problems I had were solved using alsamixer.
    – Pedro Werneck
    May 23, 2012 at 0:30

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