It appears that
upowerd is hogging my cpu time, I killed the process, but it has returned, and is climbing in resource consumption. Do I need upower? can I disable it?
I am using ubuntu Mate 16.04.
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.