Comment 3 for bug 337947

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Ricky Campbell (cyberdork33) wrote : Re: [Jaunty] No sound output with MacBook 5.1

Chris can you check if this bug represents your problem? If so, this should be marked as a duplicate.
https://bugs.edge.launchpad.net/ubuntu/+source/alsa-driver/+bug/337314

Either way, providing the data provided by running the script:
http://www.alsa-project.org/alsa-info.sh
Will be helpful for this bug.