Had a bit of a success with HDMI audio and also video acceleration on OrangePi 3. What was needed was to apply some patches from LibreELEC, namely ones from projects/Allwinner/patches/linux/ . For HDMI audio to work you need 0004-sun4i-i2s-improvements.patch , which contains support for I2S on H6. When done right you should see in dmesg: asoc-simple-card sound: i2s-hifi <-> 5091000.i2s mapping ok Also what helped was an IRC chat that Jernej had with mirko some time ago: