I am newbie of Ubuntu 12.04 with Gnome3 Shell. Laptop Model: HP Pavilion DV6 1280US Full Updates Installed. I can hear sound played only when headphones are plugged in. Regular inbuilt speakers doesn't work. Speakers are fine, it should be some technical configuration/driver issue with OS. They work in the Windows OS in the same laptop. Kindly check these two snapshots: Ubuntu Geeks Kindly help me!