Sorry for the sparse info. I think this is related to a kernel bug that has been identified and is just pending full implementation.
https://bugs.launchpad.net/ubuntu/+s...x/+bug/1935850
It seems some claim that it is working with 5.11
https://www.reddit.com/r/Fedora/comm...ng_on_34_beta/
but I've tested with Fedora 34 (unsure kernel), Arch (kernels 5.10.x LTS, 5.14.5, 5.14.6, and 5.15rc1), Manjaro with kernel 5.14.2, and Ubuntu with kernel 5.11.0-34 and was not able to get it working in any of those.
I've found some other possible solutions but they all reference older versions of sof-firmware (I believe current on Arch is 1.8.something).
https://gist.github.com/ThHareau/450...bd9830d88adeb7
and
https://blog.fts.scot/2020/07/04/del...king-on-linux/
I'm hesitant to apply those because it seems others have and updates can break the fix. I suppose that could be addressed with blacklists though.
I think this 2021 model of the XPS (9710) uses the same audio chipset as the 2020 version (9700) which is a Realtek ALC711-CG.
I have installed Ubuntu 21.10 (Impish Indri) daily build from today (2021-09-20) and after countless hours over the last few days, I finally have sound from the speakers in Linux. Unfortunately I'm not overly interested in running Ubuntu and I'd really like to get this working in Arch.
I suspect that, with my limited expertise, I may just be better off waiting until these changes get implemented into the kernel and/or the sof-firmware updates.
But if anyone has thoughts for how I can gather sufficient info with a working Ubuntu setup to make it also work in Arch, I think I'm game to give it a shot.