How to make xscreensaver stop from promiting for user input
Sometimes xscreensaver will prompt the user to enter their password thinking they are trying to unlock the computer.
This is annoying!
xfce4-power-manager is simulating fake KeyPress events.
This basically means your computer thinks someone is pressing the keyboard and thus stops your screensaver and offers a login menu.
This will usually happen every 30 seconds or so.
The instant solution is to close
More permanent Solution
I never had any issues removing the power manager on any pc I have worked on.
sudo apt-get remove xfce4-power-manager