Thanks for reporting this! I believe this was a regression between the 3.11.0-12 and 3.11.0-13 kernels (and is also present in 3.11.0-14).
System76 is aware of this and we'll do our best to make sure a fix is in the next stable kernel update. Thanks again! ** Changed in: alsa-driver (Ubuntu) Status: New => Confirmed -- 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/ubuntu/+source/alsa-driver/+bug/1256655/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs