Try dexconf. A couple of weeks ago I had trouble configuring xorg.conf to work with my Wacom tablet. When my manual edits of xorg.conf caused problems, dexconf wiped out the file and replaced it with a pure vanilla version. Eventually I found successful manual edits to make the Wacom tablet work. After each edit it is necessary to stop and restart gdm or xdm or kdm - whichever you are using. Tom George