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In KDE settings pressing left and right modifier keys have no difference, for example, Alt+X works both with left and right alt keys. Is it possible to make them different?

Using xev you can see that these keys produce different events, so it's the KDE question.

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Since no one has answered this, I'll try to give you a few clues as to where to look as I don't know the answer myself.

I have seen posts on it before, so I had some idea of what to look for.

(This would be way too ugly to put into a comment.)

Look into X tools including xdotool and the .xbindkeysrc


How do I remap certain keys?

The Linux keyboard and console HOWTO

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