Hello,
I have the same problem on Ubuntu LTS 24.04. Basically HDMI has no audio unless I disconnect and reconnect the wire manually.
I tried this workaround and installed sof firmware, but there is no difference. [RESOLVED] No Audio via HDMI - #16 by Nic
This issue is a very annoying one, I’m using my 11gen motherboard in a coolermaster case as a media center, and having to manually disconnect/reconnect the wire every time I want to watch a movie is not exactly optimal! If someone has a working solution I’m all ears!