thanks a lot
In order to test your suggestions I tried them under Debian 9 -
32-Bit - however these programs do not exist on my debian 9 -
neither xinput and for libinput I found:
bash: libinput: Kommando nicht gefunden. #--- command not
found
root@primergy:/home/kampmann# whereis libinput
libinput: /usr/share/man/man4/libinput.4.gz
Any ideas?
Jörg