Comment 4 for bug 1610619

After the reinstall xscreensaver is still locking by default. I can disable this feature in Settings and it is now fine (Because it does not lock). However, I wanted this locking feature, it is still a bug in that enabling this locking feature still locks the screen for the guest account, which uses a blank password to sign in (which then cannot be used by xscreensaver because it does not accept null/blank passwords.
   I would suggest that fresh installs of xscreensaver disable screenlock by default. I believe as far as light-dm is concerned, after a quick google search i found that the setting or flag it needs to enable to prevent screenlocking might be available in gconf... but i dont know the specific area where this would need to be implemented without looking...