How to fix built-in speaker audio on Fedora 43

I run both Fedora and Bazzite on my Steam Deck (LCD) in dual boot. Since upgrading to Fedora 43, I could no longer get the audio on the built-in speakers to work. It was still working on Bazzite.

After diving into it, I managed to fix it. Here’s how, in case it’s useful to anyone else.

I used the ALSA / ucm2 config from Valve’s repository for audio processing for their hardware: github.com/evlaV/valve-hardware-audio-processing

Try:

git clone https://github.com/evlaV/valve-hardware-audio-processing.git
sudo cp valve-hardware-audio-processing/ucm2/conf.d/acp5x/* /usr/share/alsa/ucm2/conf.d/acp5x/
sudo mv /usr/share/alsa/ucm2/conf.d/acp5x/Valve-Jupyter-1.conf /root/

Note this is for the Steam Deck LCD version (you can check that cat /sys/devices/virtual/dmi/id/product_name gives Jupiter). The repository also contains configuration for the OLED version, but the commands may be different.

Hope it helps anyone!