There were some changes to the NID detection recently, so it might make sense 
to try a snapshot: 
https://wiki.ubuntu.com/Audio/InstallingLinuxAlsaDriverModules - can you please 
do that and retry, and report back if everything is now working?
Also if you're not the original bug reporter, also attach an 
https://wiki.ubuntu.com/Audio/AlsaInfo so we can make sure you're having the 
same hardware. Thanks!

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No sound from Internal Laptop speakers
https://bugs.launchpad.net/bugs/571165
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