Version: (using KDE 4.1.2) OS: Linux Installed from: Ubuntu Packages When I click the Display icon, the screen goes black, my monitor reads "no input signal" and then it turns off. I have to ctrl-alt-backspace to restart my session.
I should add that this means I am unable to turn on powersaving for my monitor... it's been turned on since KDE4 was released!
This is fixed in 4.1.3.