http://wiki.gentoo.org/wiki/LightDM#RazorQt
The LightDM KDE greeter also provides a KCM (KDE Control Module), which appears in the System Settings under System Administration → Login Screen (LightDM)
Due to LightDM currently assuming GTK+ greeter as the default, in case you want to use the KDE greeter, you need to explicitly specify it in the /etc/lightdm/lightdm.conf:
I'm assuming the rest of it applies, etc, to Sabayon?
TY.

