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I usually run sound from my laptop through my headphone jack into a mixer so I can listen to music through my big PA speakers. The moment I upgraded the OS, however, it stopped working when plugged in, no audio at all. Sound still comes through the laptop speakers when unplugged, though. I dual boot, so I logged into Windows and the sound worked fine. What should I do to fix it?

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Welcome to Ask Ubuntu! This question should instead be filed as a bug report, thanks! Instructions here. – Jorge Castro May 2 '12 at 20:24

closed as off topic by fossfreedom♦ May 16 '12 at 19:35

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Try alsa. You can install it by 

sudo apt-get install alsa-base alsa-utils
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