I have a Dell Latitude 9420 which contains with a Realtek ACL711-VD audio chipset. The headphone jack works since Kernel 5.13-rc5, and the internal microphone seems to be working, too.

But the internal speakers do not. I can select them as audio devices, but they remain silent.

This looks very similar to the problems reported in bug #208555 regarding the ALC287 on new Lenovo laptops, although the initialization verbs provided there seems to not have any effect on the ACL711.

I've already tried to use a Windows VM with qemu to extract my own set of verbs (as suggested in https://bugzilla.kernel.org/show_bug.cgi?id=208555#c205), but I failed to get the device working in Windows. The device shows an error called "failed to setdx on fw" in Windows' Device Manager.

Output from alsa-info is available at http://alsa-project.org/db/?f=e49d87d2ee7caec416dd9c576b066be03bed6090