Ok, trying to bypass the usual flames (I used CDE for years, then KDE until it got dumbed-down too much, and we all know how GNOME has turned out) ... I've decided to try out xfce on CentOS 7. I grabbed xfce from epel by installing the following via yum: epel-release @xfce So far it's pretty good, and is giving me the basic features I'm looking at without getting in my way. However, I can't seem to get the damned screen lock function to work. Leaving the monitor idle doesn't generally do anything. (Although just now, after having left it for a few hours, I got a blank screen with a few vertical narrow white bars that wouldn't respond to any key or mouse movement. Switching to a text console and back to the graphics console, however, brought up the xfce desktop again, but with no screen lock prompt.) If I select the 'Lock Screen' menu item from the top right corner of the screen it does nothing; doesn't lock the screen, provides no feedback that there's a problem, etc. The page <http://xmodulo.com/control-screen-lock-settings-linux-desktop.html> describes (for XFCE) bring up "Settings Manager" => "Screen Saver", but there is no "Screen Saver" option in the Settings Manager. A clue stick would be appreciated. Devin