Are you sure? IIRC it was HAL that picked the kernel events and converted to D-Bus signals, but it has been deprecated a long time ago. I gave a cursory glance

Are you sure? IIRC it was HAL that picked the kernel events and converted to D-Bus signals, but it has been deprecated a long time ago. I gave a cursory glance to the systemd/src/udev files and found no mention of dbus.