[ubuntu] No sound in precise after kernel upgrade

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http://ubuntuforums.org – Hi all, In Ubuntu 12.04, after performing an upgrade that included a kernel update, I no longer have any sound. The sound worked fine before the upgrade. Oddly enough, if I plug in headphones I do get sound through the headphones, but without them I am no longer able to get any sound from my laptop's internal speakers. I'm not quite sure what additional info I should provide, so here's some info to start. Please let me know if there is anything else I should add. Laptop: HP Pavilion DV6 OS: Ubuntu 12.04 (Precise Pangolin) 64-bit $ lspci | grep Audio 00:1b.0 Audio device: Intel Corporation (Hardware)