I was experiencing this bug. With the upgrade to kernel 3.19.0-21-generic, the issue seemed to go away and my HDMI audio out returned. However, if the computer goes to sleep the HDMI audio disappears again. Restarting the computer is the only solution I have found to bring it back, but it again disappears if the computer suspends.
-- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1457369 Title: kernel 3.19.0-18 breaks HDMI audio for snd_hda_intel To manage notifications about this bug go to: https://bugs.launchpad.net/system76/+bug/1457369/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs