I use Slackware 11. X-Windows worked well with no manual configuration except that the scroll wheel on my mouse did not work. To get the scroll wheel to work, I added a line in my /etc/X11/xorg.conf file that says:

   Option "ZAxisMapping" "4 5"

and I changed the line that said

  Option "Protocol"    "PS/2"

so now it says

  Option "Protocol"    "IMPS/2"

Then after I restarted X, it works.