Comment 4 for bug 42553

YES!

I've commented out the entries
        InputDevice "stylus" "SendCoreEvents"
        InputDevice "cursor" "SendCoreEvents"
        InputDevice "eraser" "SendCoreEvents"
I have there and the errors, e.g. during startup of konqueror, are gone.

So, two (or one?) of those devices, where I don't have a clue what they are for, seem to cause an error.