On the kdebase-3.5.6 package the special fedora-like customization of kdm is
KDM look like the version from the upstream and the KDE desktop will not started
I have found the reason for the issue.
For an unindentified reason /usr/share/config/kdm was damanged and a
/usr/share/config/kdm.rpmnew file was created.
I have remov the kdm file and have recreate the kdm handlink manualy. After I
have done this, I have remove the kdm.rpmnew hardlink.