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

[Jon TURNEY]

On 18/02/2015 02:54, rhofmann@rayed.de wrote:
> 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.

Unfortunately, there doesn't currently seem to be a way to configure X 
to act in this way.

In xkeyboard-config language, you are trying to access the "3rd level 
shift" for a key (1st level is the normal key, 2nd is the shifted key)

I believe that the standard (DIN 2137) specifies that this 3rd level is 
accessed by right alt.

ctrl + left alt being equivalent to right alt is a Windows-ism [1].

See the upstream bug [2], you might also find the discussion in [3] of 
interest.

[1] http://en.wikipedia.org/wiki/AltGr_key#Control_.2B_Alt_as_a_substitute
[2] https://bugs.freedesktop.org/show_bug.cgi?id=37232
[3] https://bugs.launchpad.net/ubuntu/+source/xkeyboard-config/+bug/822872

-- 
Jon TURNEY
Volunteer Cygwin/X X Server maintainer

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