Getting sound working on an Asus Chromebook C423N (codename: RABBID) is hard. It took me 2 weeks and probably a dozen hours of trial and error. The normal chromebook sound fix scripts by Wierdtree at chromebook-linux-audio will give you very threatening warnings if you try to use them with this hardware. And of course they don't work.
I tried installing windows instead and after fixing the touchpad manually I found the only option was $5 paid audio drivers from a fellow called coolstar [CoolStar SST Audio (AVS) [AUE ONLY]]. I eventually gave in and bought them. But bad luck: coolstar isn't running the business anymore and it's actually a scam now and the drivers download links are never made available and one just gets completely ghosted via the suggested email support and via patreon. So I'm trying to get a refund now. Big lesson? coolstar's paid chromebook driver program (https://coolstar.org/chromebook/windows.html) is now a scam. Don't do it.
I gave up on windows and went back to trying a handful of different linux distros and versions. I eventually found a forum post from a linux mint user who reported that using the oem 22.04 kernel on linux mint 21.1 made it possible for audio to work on the C423N. And he was right, though it was no straightforwards process since intel-sof firmware no longer even exists in the repositories. I had to find the new sof fifrmware, figure out which bits I needed and then manually copy the drivers and topology files(?) into place and make my own config. That enabled the audio devices and all that was left was to configure them so pulseaudio could actually see input and output.
At the end of all this I had an LLM condense it into a bash file that will automatically set up audio on linux mint (and probably other ubuntu/debian distros) for the Asus Chromebook C423N (RABBID) hardware. If nothing else you can look at it and see how to adapt it for your distro. Hopefully you don't spend as much time on it as I have if you found this via search.
sound-fix-script_asus-Chromebook-C423N-RABBID-ApolloLake-DA7219-MAX98357A.sh.txt
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