Just got my A04 and put it together.
In the sound (alsa) controls, the only output is “dummy”. If I go all the way to the right - under Configuration - it says “no cards”.
More damning, in dmesg is:
No soundcards found.
Is this a known issue ? Thanks.
upgrade system packages
sudo apt update && sudo apt install -y devterm-kernel-current-cpi-a04 devterm-gearbox-a04 devterm-fan-daemon-cpi-a04
flash new os image
Had the same issue on mine, this fixed it.