It drove me mad that i logged always out from XGL after pressing accidentally shift-backspace. You have to type: xmodmap -e "keycode 22 = BackSpace BackSpace" after your Window Manager started (that would be beryl in my case). And because my AltGr key didn't worked too i first looked at the keycode with xev which was 113. Then a little lookup how the key is occupied: xmodmap -pk And finally to make the key work again: xmodmap -e 'keycode 113 = Mode_switch' And because i am a lazy person and dont want to type that over and over again to load it on startup i put both in my ~/.Xmodmap file: echo 'keycode 22 = BackSpace BackSpace' >> ~/.Xmodmap echo 'keycode 113 = Mode_switch' >> ~/.Xmodmap

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