The user who reported it verified that the following hints worked:

hint.hdac.0.cad0.nid20.config="as=1 seq=0"
hint.hdac.0.cad0.nid33.config="as=1 seq=15"

Also, I am not sure whether LENOVO_I2_SUBVENDOR is a correct name. He mentioned having a "Lenovo Ideapad 2" but I am not sure if this the actual model. I am open to renaming this.

In D45100#1028614, @emaste wrote:

I couldn't find a useful reference for a name elsewhere so I think it's fine, although I might go with LENOVO_IDEAPAD3_SUBVENDOR

I chose I3 instead of IDEAPAD3 so as to follow the convention used for LENOVO_I330_SUBVENDOR, which is used for Ideapad 330.

I propose to make a follow-up patch to change both to IDEAPAD*.

In D45100#1028617, @christos wrote:

In D45100#1028614, @emaste wrote:

I couldn't find a useful reference for a name elsewhere so I think it's fine, although I might go with LENOVO_IDEAPAD3_SUBVENDOR

I chose I3 instead of IDEAPAD3 so as to follow the convention used for LENOVO_I330_SUBVENDOR, which is used for Ideapad 330.

I propose to make a follow-up patch to change both to IDEAPAD*.

D45105

I can report that on a freshly built/installed world/kernel at:
15.0-CURRENT FreeBSD 15.0-CURRENT #1 main-n270118-94b09d388b81-dirty: Mon May 13 12:57:41 PDT 2024
with this patch; the sound just works. Required no additional efforts on my part.