I'm running Ubuntu 22.04 LTS desktop minimal on an Asus Prime B660M-K D4 motherboard with an Intel Core i5-12400 processor. I'm using the onboard HDMI connected to a Marantz receiver which is connected via HDMI to a TV.
I've tried the following applications (all latest versions) without success:
In each case, passthrough configuration options are either greyed out or not showing.
The output of alsa-info is here: http://alsa-project.org/db/?f=a3ebf9785feaf54602aed36ed8163566fcfbed17
Note that multi-channel audio (e.g. 5.1 PCM) works fine for VLC and Kodi (but not MythTV in which I cannot select more than 2 speakers regardless of ALSA device) but passthrough does not.
I also have an older PC with an nVidia 630 video card running Ubuntu 20.04 and the same MythTV version which is also connected to the same Marantz receiver and TV. Digital audio passthrough works fine on this box (DTS, TrueHD, DDD+, etc).
Does anyone have any suggestions?
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