[SOLVED] HDMI no sound Onkyo tx-nr474

[CoppolaVH]

Hi!

You have to disable screen blanking to have audio on HDMI. Or you can set option in config.txt:

hdmi_blanking=0


Option "wake display on play" didn't work for me.

Hardware volume on HDMI is initially at 0, which can be a reason for no audio. Hardware volume doesn't use CEC commands, so it is probably no different than software volume. I set it to none.

Default HDMI audio is 16-bit. You can switch to vc4-kms-3d driver, but I haven't been able to configure it correctly. Maybe there is a guide for it?

Regarding your comment on vc4-kms-3d driver and default HDMI audio being 16-bit, you are correct that my 24 bit music is playing at an output rate of 16 bits, so I will dig into that next.