Version: (using Devel) OS: Linux Installed from: Compiled sources With compositing enabled, after locking the screen (and no screensaver is configured) and somebody moves the mouse there is a short time where the actual desktop is displayed after the screen gets dark again and asks for a password. If somebody would set up a camera and then move the mouse he could grab a screenshot...
Configuring/selecting a screensaver actually does not solve the problem...
could you please try if this is related to bug #177495?
just tested w/ and w/o UnredirectFullscreen=false - so yes, it is. *** This bug has been marked as a duplicate of bug 177495 ***
BUt i don't get flickering fullscreen applications on any of the 2 tested machines.....
the flicker oly occurs when you open another window (dialog/popup) and thus the fullscreen window gets re-redirected (and re-undirected after the other window closed) edit "~/.kde/share/config/kwinrc" (it might be ~/.kde4/... on your distro) find the section [Compositing] add a key UnredirectFullscreen=false reconfigure kwin (konsole) qdbus org.kde.kwin /KWin reconfigure test whether the screenlocker issue persists