I have had both KDE4 and KDE Plasma5 automatically boot to the desktop. No login necessary. Here are my notes for KDE4:
This will only work for KDE AFAIK.
You'll need to have "root" edit: /etc/inittab and change id:3:initdefault to 4.
Code:
# Default runlevel. (Do not set to 0 or 6)
id:4:initdefault:
(If you were to change nothing else at this time, the next time you reboot you will be greeted by a graphical login screen where you can choose the Desktop / Windowmanager / Whatever and enter your username and password.)
KDE 4:
Now in your program menu go to:
Code:
System Settings
Account Details
Scroll down to "System Administration"
Login Screen
From the tabs pick "Convenience"
Auto-login [X]
YOUR_USERNAME
Enable Password-Less Logins
Apply
EDIT - Now you can reboot and login automatically to KDE without having to enter your username and password.
NOTE -- This can prove to be a real PITA if you ever want logon another user OR if you ever desire to use any other desktop than KDE.