This is an advisory note if you happen to use pulseaudio and want to trial vdev.

The issue is that pulseaudio has a builtin dependency on udev via its module  module-udev-detect.so (e.g. /usr/lib/pulse-7.1/modules/module-udev-detect.so), and the associated stanza in /etc/pulse/default.pa, perhaps at lines 53-60:

### Automatically load driver modules depending on the hardware available
.ifexists module-udev-detect.so
load-module module-udev-detect
.else
### Use the static hardware detection module (for systems that lack udev support)
load-module module-detect
.endif

You should thus rename or remove module-udev-detect.so, or make the stanza be just:

load-module module-detect

Either way should be enough to keep sound working.