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[ubuntu] No sound Ubuntu 10.04 on Macbook 4,1

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linux-howto

http://ubuntuforums.org – In the article, https://help.ubuntu.com/community/MacBook4-1/Lucid , it says that sound works out-of-the-box, but when I booted up from a upgrade from 9.10, I can't hear any sound. I've already looked at the alsa config file, but nothing seems wrong. Any suggestions? (Hardware)