[gentoo-amd64] No kdm after 2005.0 upgrade

[Daiajo Tibdixious]

According to
http://www.gentoo.org/doc/en/kde-config.xml
I only have to put DISPLAY_MANAGER="kdm" in /etc/rc.conf, which I have done:
$ grep DISPLAY /etc/rc.conf
DISPLAY_MANAGER="kdm"
and have xdm in the startup:
$ /sbin/rc-update show xdm default | grep xdm
                 xdm |     default
and kdm should start.

However, xdm starts instead of kdm.

I have tried setting XSESSION in /etc/rc.conf to various values, however these all give X with no login manager
and no kde.

I had kdm running find under 2004.3, it stopped working when I upgraded to 2005.0 (as did many other things,
everything is now fixed except this).
I have to be missing something obvious, I can find no more in the documentation.
I'm running kde 3.4.3
I'm going to go thru the xdm startup to try to figure this out, which will take a while,
I just wonder if anyone can spot the flaw straight away?