On Sun, May 9, 2021, at 12:47, Elia Nolz wrote:

On Sun, May 9, 2021, at 12:17, Yuuki Harano wrote:
Does this work for you?

(put 'none 'modifier-value 0)
(setq x-hyper-keysym 'none)

Yes this works perfectly for ISO_Level5_Shift. Thank you very much.

Sadly I stumbled upon another problem:

ISO_Level3_Shift combined with other modifiers is also partly broken. E.g. when using C-ISO_Level3_Shift-w (ISO_Level3_Shift-w is & in my layout) it just sends '&' instead of 'C-&'. Strangely enough the same is not true for 'C-ISO_Level3_Shift-a' which sends 'C-]' as it should. And 'C-IL3-u' sends 'ESC' instead of 'C-['. I am thoroughly confused.

I tested it a bit more and ended up with the following list:

Working key combinations (Ctrl and ISO_Level3_Shift held):

C-_

C-[ (I have since realized that it is expected behaviour that this sends ESC)

C-]

C-^

C-\

C-/

C-{

C-}

C-|

C-~

C-`

C-@

Non-working combinations (Ctrl held):

C-ü

C-ä

C-ö

Non-working combinantions (Ctrl and ISO_Level3_Shift held):

C-…

C-*

C-#

C-$

C-!

C-<

C->

C-=

C-&

C-?

C-(

C-)

C--

C-:

C-+

C-%

C-"

C-'

C-;

C-ſ

I am not really sure how to debug this further since I do not know where the processing of interpreting a key press starts in Emacs. Any tips on this?