NanoPC-T6 - Audio Passthrough (IEC958)

[Tiemichael]

I am running Ubuntu 24.04 on my NanoPC-T6, and I am unable to get Audio Passthrough running.

After eliminating all Pipewire and Wireplumber related issues, I was looking at ALSA, but also here 'aplay -l' and 'aplay -L' don't show anything related to IEC958, which makes we wonder if this is supported in the kernel.

uname -r: 6.1.0-1025-rockchip

zgrep ROCKCHIP /proc/config.gz shows 'CONFIG_SND_SOC_ROCKCHIP=y' but nothing like 'CONFIG_SND_SOC_HDMI_CODEC=m'.

What could be the issue?
Thanks!

[specs]

What distribution do you use and what kernel version?

With kernel 6.11.9 (debian) I get from aplay -L:

hw:CARD=realtekrt5616co,DEV=0
realtek,rt5616-codec, fe470000.i2s-rt5616-aif1 rt5616-aif1-0
Direct hardware device without any conversions

(HDMI audio does not work with 6.11-kernels, see the collabora rock5b page.)