nb : for other noob like me, that'll save you the "how to" search :
sudo gedit /etc/default/grub replace GRUB_CMDLINE_LINUX_DEFAULT="quiet splash" with GRUB_CMDLINE_LINUX_DEFAULT="i915.disable_power_well=0 quiet splash" -- 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