Hello list, I did some further research. In particular I used the
live-ISO-image of Buster (amd64) on DVD and bootet the system. And I
found the following:
Mouse still is irrational. It works fine, when no application has
startet after logging. When then an application is started (in this case
firefox of the DVD) the mouse mostly does not move. It jumps. And when
there is a button something similar, the mouse behaves even worse. I did
not dig into the "InputClass" because I did not find it.
So any help is urgently needed.
tia
Jörg
