Hi Peter,
Yes, pleased file an issue in our tracker and please provide the alsa-info and the kernel log with https://thesofproject.github.io/latest/getting_started/intel_debug/su ggestions.html#enable-dynamic-debug
Fwiw, I have tried HDMI on my TGL laptop and audio works correctly with: 6.4.6-artix1-1 (basically Arch kernel) sof-firmware 2.2.6-1 also tried with 2:2:0-57864 (which looks like you have) and have not encountered issue. I have used HDMI cable (no display capable USB HUB in use on my desk).
can you downgrade to 6.3 kernel (and perhaps to 6.2 and 6.1 non LTS) to narrow down the possible regression and also try to update sof- firmware to latest?
Thanks for getting back to me. I'll do all of those things next week, when I have access to my laptop again.
I only noticed the problem after I upgraded from 6.3 to 6.4, though it is possible that it was present before and I didn't notice, so I'll check.
Best, Alex