It worked! Thanks again.
it's been a beautiful experience.
Now I have two new questions (if this is the trend, the questions will grow exponentially :) ).
1. When I changed the compilation option CONFIG_DRM_I915 using make menuconfig, I used a search functionality given by the program. In the results of the search the option appeared in a record, and I remember that a field was "prompt". The question is: how are all these options organized and, in particular, what is the meaning of prompt? Is there a way to study the structure and the interdependence of the different options?
2. Now startx starts and I can see xterm windows as I asked in ~/.xinitrc, but I don't see any mouse pointer or, if i3 window manager is called, I see a mouse pointer in the center of the screen but I can't move it with touchpad. Where would I search the reason of this? Another kernel compilation option?
Ciao (italian regards)