I am using the plasmoid to show the battery status. But powerdevil is not installed; because I don't want any action. I just need to see how much charge is left. The plasmoid has a checkbox to disable power management. But whether it is checked or not, the screen will be locked if there is no input for a while. After installing powerdevil, the checkbox about disabling power management actually works. Without installing powerdevil, the screen will be locked after a timeout and there is no way to stop or configure that. I find it a bit weird, I suppose that the screen locking functionality should be moved inside powerdevil. Reproducible: Always Steps to Reproduce: 1. Remove powerdevil, if you have it 2. Enable (or disable) power management in the plasmoid 3. Wait 4. The screen will lock Expected Results: No power management
PowerDevil is providing the freedesktop inhibition interface where plasma would send an inhibition to, so without it, it cannot work obviously.