My use case is that I tend to turn on the computer and want it to be readily available when I come back a few minutes or some hours later. I also don't want my small kids to play with the mouse and create havoc to my system.
When the machine boots into kdm (or gdm, wouldn't make a difference), I still have to login to the desktop after turning the machine on.
That is because there is no way to boot into KDE (or Gnome, wouldn't make a difference) and have the screensaver to be started and lock immediately and in any case, even if there is user intervention.
That's a refinement of automatic login I think. It's an improvement of automatic login in security sense, in as so far, as the password will be needed again. The benefit will be that once I enter the password to the screen, the desktop session will already be fully loaded.
In my case with Digikam running with some thousands of photos and quite a few other programs, sesssion restore takes quite a while. Also, while kdm (or gdm) may look pretty, I even more like to run the slide slow screensaver with images of my family.
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