By accidently hitting some combination of keys I switched the setting for the
cap lock key. That is when the caps locks key light is on, lower case keys were
typed and visa-versa. I know this was a KDE and not an X[org] problem because
logging off KDE fixed the problem.

The keys hit had to be some combination of shift/ctrl and perhaps but less
likely caps-lock and another key (probably with my right hand).

My question is not which keys do that so much as, how do I undo it?