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

[Jon TURNEY]

On 18/02/2015 23:07, Thomas Wolff wrote:
> Am 18.02.2015 um 14:35 schrieb 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.
> Your description is quite inprecise; which terminal do you use (xterm?)
> and what exactly do you expect and see in those cases?

I believe that '{' is on the 3rd shift level of 7 on a German keyboard.

So AltGr-7 gives '{', and (under Windows) Ctrl-LAlt-7 does the same.

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

What I meant to say is: There doesn't seem to be a simple way to 
configure X to act in this way.  You could make you own keyboard layout 
which behaves 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].
> Again, not sure exactly what effect you suggest but in fact
> Ctrl+Left-Alt and AltGr can be distinguished and it works in both xterm
> and mintty. (It's a bit tricky and I don't recall the details right now,
> it involves considering the sequence of events.)

The problem isn't that Ctrl-LAlt and AltGr aren't distinguished to X.

The problem is that the X keyboard layout doesn't map the Ctrl-LAlt-key 
combination as Windows does.

Ideally, we would have something like 'setxkbmap -option 
lv3:mswin_compat' to configure that mapping, but that doesn't exist at 
the moment.

-- 
Jon TURNEY
Volunteer Cygwin/X X Server maintainer

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