I've been trying to figure this out for my xbox media center (xbmc) from a Fedora 15 minimal install. Looks like you just need to install a systemd service that does the autologin.
Here's what I got to autologin user "xbmc". Create this systemd service:
Description=xinit for %i
ExecStart=/bin/bash --login -c startx
Put the above file in
Add a symbolic link to it from
You can do something similar by replacing "xbmc" with your user name of choice