1. Go to "System Settings"->"Sound" 2. Select the "Hardware" tab 3. Click on the dropdown list (Profile) 4. Select "Digital Stereo (HDMI) Output"
In step 4, that was what it worked for me. There are several options there. I haven't installed anything else from what it comes with the standard installation set. Just updated the system.
Hope this will help. Regards, Daniel.