After remastering and updating a few times, I've lost the default behavior of starting X as user knoppix without asking for password. Now it starts kdm or xdm (depending of which one I select), but it sticks in the login screen, and, as there is no password, it won't let me login.

I could kill it and start another X server, but I want it to go as straight as possible to a usable system, because I can cope with this trouble, but many of the people that will be using it won' be able to fix it.

Thanks in advance.