Sound card is no longer working under kernel 6.12 - still works on 6.6

$ systemctl --user restart pipewire-media-session
Failed to restart pipewire-media-session.service: Unit pipewire-media-session.service not found.

Ah, I have wireplumber, not pipewire-media-session:

● wireplumber.service - Multimedia Service Session Manager
     Loaded: loaded (/usr/lib/systemd/user/wireplumber.service; enabled; preset: enabled)
     Active: active (running) since Thu 2025-02-13 15:40:44 IST; 8min ago
 Invocation: e3a55be3deb54c14a21a7eebfb8001be
   Main PID: 1490 (wireplumber)
      Tasks: 6 (limit: 38169)
     Memory: 8.6M (peak: 9.5M)
        CPU: 65ms
     CGroup: /user.slice/user-1000.slice/user@1000.service/session.slice/wireplumber.service
             └─1490 /usr/bin/wireplumber

Feb 13 15:40:44 feature-precision3630tower systemd[1385]: Started Multimedia Service Session Manager.
Feb 13 15:40:44 feature-precision3630tower wireplumber[1490]: wp-internal-comp-loader: Loading profile 'main'
Feb 13 15:40:44 feature-precision3630tower wireplumber[1490]: default: Failed to get percentage from UPower: org.freedesktop.DBus.Error.NameHasNoOwner
Feb 13 15:40:44 feature-precision3630tower wireplumber[1490]: spa.bluez5: BlueZ system service is not available
Feb 13 15:40:44 feature-precision3630tower wireplumber[1490]: wp-device: SPA handle 'api.libcamera.enum.manager' could not be loaded; is it installed?
Feb 13 15:40:44 feature-precision3630tower wireplumber[1490]: s-monitors-libcamera: PipeWire's libcamera SPA plugin is missing or broken. Some camera types may no

By the way, I’ve restarted my computer after all that for good measure, ALSA still doesn’t recognize the sound card…

The latest alsa-info: http://alsa-project.org/db/?f=0b36b32b442fa71a92b87b44a515ffcac87fa491

I wonder what’s the difference between my setup and a vanilla install (where sound works with kernel 6.12).