hello,
i switched from lightdm to gdm, and after rebooting my computer gdm showed up, looking fresh and nice;
problem is after login in for the first time, i dont have a lockscreen anymore, gdm just doesnt show up - so i cannot get my laptop to lock its screen;
if I switch back to lightdm everything works again, but I really do want to try gdm, lightdm is really slow on my computer, any ideas?