this post was submitted on 07 Oct 2025
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I'm sure you've spent a lot of time trying different things, this is what I found:
In Linux Mint's sound settings (Applications -> Preferences -> Sound), under the Hardware tab, choose a profile that does NOT mention anything digital or IEC. For example, select "Analog Stereo Duplex." This can help PulseAudio avoid blocking the digital output and allow passthrough to work properly through ALSA.
Use alsamixer in a terminal to select the motherboard's sound device and ensure SPDIF outputs are enabled and not muted. Sometimes SPDIF is muted by default.
In terminal, run gstreamer-properties and set Default Output to ALSA with the digital device as the output. This bypasses PulseAudio and can solve passthrough issues.
Not actually sure if any of that will help, but I tried. ๐