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Hello this is a brand new laptop: HP Envy x360 m6-ar004dx convertible.AMD FX-9800p APU.

Sound works fine with the internal speakers and headphone jack, but will not work over HDMI. Sound settings shows HDMI and so does Pavucontrol, along with 3 profiles: Digital Stereo (HDMI) Output Digital Surround 7.1 (HDMI) Output Digital Surround 5.1 (HDMI) Output with unplugged or plugged in appended depending on whether or not it's plugged in.

alsamixer shows HDA ATI HDMI with a single S/PDIF 00.

My older laptop also shows this, but everything works as expected, the older laptop is also a AMD APU system. I do not use proprietary drivers, and I don't even know if they're available for Loki/Ubuntu 16.04.

PLEASE HELP ME! I spend alot of time hooked up to a tv using the sound through it.

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  • Same happens to me. I believe its one of the greatest bugs of this version. I have to reconfigure sound speakers to HDMI output whenever it starts. Thanks.
    – Ricardo Gonçalves
    Mar 10, 2017 at 14:06
  • Ricardo, so in your case you are able to get sound to work through HDMI? On mine, I get nothing when I select HDMI. Also, what is your hardware? Are you using an AMD APU based laptop?
    – DS-Tech Media
    Mar 12, 2017 at 2:28

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So for anyone else who may be experiencing this issue: The lack of HDMI audio is documented on Ubuntu's AMDGPU and AMDGPU-Pro wiki pages. As of Ubuntu 16.04, only the open source AMDGPU/amdgpu-Pro official open-source Radeon drivers can be used on newer model GPU's and APU's(like mine), it specifically notes:

"The open source AMDGPU driver does not support (for now) the HDMI audio. To solve this problem, you can install che "hybrid" AMDGPU-Pro driver from AMD."

The "pro" version includes SOME(as little as possible) proprietary blobs, HDMI is a proprietary, licensed technology, so this is probably included as one of these proprietary blobs.

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