When I click on System settings => Power Management => Activity Settings I see everything greyed out and I get this message: "Power Management configuration module could not be loaded. The activity service is not running. It is necessary to have the activity manager to configure activity-specific power management behavior." kactivitymanagerd is not running $ ps ax | grep kactivitymanagerd 3195 pts/1 S+ 0:00 grep kactivitymanagerd Trying to start it: $ kactivitymanagerd start-daemon org.kde.kactivities.activities: Starting the KDE Activity Manager daemon QDateTime("2015-07-06 13:12:40.310 WEST Qt::LocalTime") QWidget: Cannot create a QWidget without QApplication Aborted (core dumped) I'm using kde 5. Reproducible: Always Steps to Reproduce: 1. When I click on System settings => Power Management => Activity Settings I see everything greyed out and I get an error message. 2. I try to start kactivitymanagerd but it fails Expected Results: I should not see the window greyed out and i should be able to use the lock screen feature.
The version of the package is: $ pacman -Q |grep kactivi kactivities-frameworks 5.11.0-1 libkactivities4 4.13.3-1
If I remove the directory ~/.config that solves the problem but is only temporary because if I reboot the system the problem arises again.
I found out If I replace compiz for kwin I am able to use power management, e.g, lock screen feature. Maybe kde5 broke friendship with compiz because in kde4 they coexisted nicely.
Can you perhaps try to update to version 5.12 and see if it is fixed? I am using git master and not hitting this.
This should be fixed in the latest kactivities. Wait for the next release of Plasma and re-test please. We do not (at least I do not) test with Compiz, so things might break. It is obviously not intentional, but breakages can happen in (for us) strange setups.