Lots of info on xorg.conf stuff just Google it. But it truly is black magic so you need to find solution. I don’t have the hardware so can not help.
here is place to start
http://www.x.org/archive/X11R7.5/doc/input/XKB-Config.html
but there are a lot of tutorials on xorg.conf. There seem to be no end to the options rotfl!