i know this post is damn old, but i was searching for a solution on this and found this post several times...
so as i now found the solution i thought i could answer here for others who might have the same problem:
the line u mentioned is now located in:
/etc/kde4/kdm/kdmrc
and the we need to modify line is:
StaticServers=:0
just commenting this out won't work because it defaults to ":0"
so just remove everything after the = so the line reads like:
StaticServers=
ALSO you should comment this line out, because there is no terminal needed for the session anymore:
ServerVTs=-7
hope this helps at least a few people
greetz
FastJack2