[lug] Kill X11 Hot Keys?

[stimits at comcast.net]

Hi,
 
I'm testing some things and am not really interested in nicely and slowly exiting X11 (Fedora 23/KDE). It appears that the good old "control-alt-backspace" no longer works. Is there a way to enable this to instantly (and with great gratification) summarily destroy the current X11 session without being nice to it?
 
Thanks!
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