I have a similar laptop from BTO laptops. I noticed that a workaround exists for me. I start with closing the laptop with the cable connected until it is in hibernation and then opening it again. Selecting the hdmi using pavucontrol I can get the HDMI audio to work.
See my bugreport here: https://bugs.launchpad.net/ubuntu/+source/alsa- driver/+bug/1264665 -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1256655 Title: [Gazelle Professional, Intel Haswell HDMI, Digital Out, HDMI] Playback problem, built in speakers work but no audio over HDMI To manage notifications about this bug go to: https://bugs.launchpad.net/system76/+bug/1256655/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
