What did happen with (the use f) that file as i did be declared obsolete (in the most distributions, but not all! Some not big brother ones continue to use her xorg.conf)?
I suppose it was possible at that time to read explanation which settings of xorg.conf have to be found at which other place in the future, also now

Continues such a document to be existing?
I am searching for the ACTUAL system file containing the old settings for input units like graphic tablet, mouse and keyboards especially keyboard layout, variant and options.