This is due to some recent systemd updates to SLE-15-SP6, no doubt. Anyway, the thing that will fix this properly is an update to umockdev 0.18.1 from Factory. I already tested this theory out in my home branch where I built the SLE-15-SP6 power-profiles-daemon against Factory's umockdev: https://build.opensuse.org/project/show/home:badshah400:branches:openSUSE:Backports:SLE-15-SP6 How should I submit a new umockdev version at this stage, and is there any chance of such an update being accepted?