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

Questions on Ask Ubuntu are expected to relate to Ubuntu within the scope defined by the community. Consider editing the question or leaving comments for improvement if you believe the question can be reworded to fit within the scope. Read more about reopening questions here.If this question can be reworded to fit the rules in the help center, please edit the question.

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

Try alsa. You can install it by

sudo apt-get install alsa-base alsa-utils
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