upowerd hogging CPU

From @JonasCz, whose comment was:

Do you happen to have an iPhone plugged into your computer ? If so, you may need to select "Trust this computer" on the phone (or disconnect it), which may fix it: bugs.launchpad.net/ubuntu/+source/upower/+bug/861642

Unplugging the Iphone solved the issue, or was an acceptable answer for me.