From: thorongil@telenet.be   
      
   On 12.12.2021 at 16:54, eho scribbled:   
      
   > BUT when I inside okular start presentation mode (STRG+SHIFT+P),   
   > this comes up (command line):   
   >   
   > org.kde.okular.ui: Unable to inhibit screensaver   
   > QDBusError("org.freedesktop.DBus.Error.ServiceUnknown", "The name   
   > org.freedesktop.ScreenSaver was not provided by any .service files")   
   >   
   > [...]   
   >   
   > What has okular to do with screensaver?   
      
   Okular is a KDE-native application.  In its presentation mode, it will   
   prevent the KDE-specific screensaver (or screen locker) from kicking in.   
      
   It does this by communicating with the window manager by way of qdbus,   
   which is a qt-specific IPC bus that KDE software uses quite extensively.   
   But you're running XFCE, which is entirely GTK-based.   
      
   > Why did this message come up after an upgrade   
   > (sadly I don't remember which)?   
      
   Probably because of a change upstream, or perhaps because of a change in   
   packaging.   
      
   --   
   With respect,   
   = Aragorn =   
      
   --- SoupGate-Win32 v1.05   
    * Origin: you cannot sedate... all the things you hate (1:229/2)