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"

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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

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