Hi @BostonX,
I don’t think any of the HD Audio drivers for Linux (the drivers used to speak to HDMI ports) support Native DSD modes. When we first added our multichannel+HDMI support, I did some research into this and concluded that it was just something that Linux could not do.
Are you aware of any other Linux-based servers that have this working? If so, it might give us a path to do some investigation.