ctrl-alt-{ ctrl-alt-[ ctrl-alt-] ctrl-alt-} not working as expected german keyboard on notebook

[rhofmann@rayed.de]

Dell Latitude E6540, german keyboard.

I can type AltGr-{ ... and so on, but ctrl-alt-{ ... as labeled on the 
keyboard gives something wrong.

It seems like when Alt is pressed Ctrl (Strg) is ignored, it gives the 
same keys as without Ctrl.

I tried some things with setxkbmap, but no success.

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