Ubuntu – How to disable all locking in 14.10

14.10lock-screenSecurity

I don't want the machine to prompt for password on resume from suspend, I don't want the machine to lock after a certain period of inactivity. At the moment, I only want it to lock

a) when it boots up the first time and
b) when I explicitly tell it to do so. I've tried:

• toggling everything in System Settings (security settings, power settings, display/desktop settings, etc)
• unity tweak tool
• toggling org.gnome.desktop.lockdown disable-lock-screen
• commenting out LOCK_SCREEN in /etc/default/acpi-support

nothing works: if I leave the machine for more than org.gnome.desktop.session idle-delay, it locks; if I xset dpms force off, it locks; if I close the lid & suspend, it locks. Of course, with disable-lock-screen set to true, CTRL+ALT+L just blanks the screen momentarily and then does NOT lock.

I'm contemplating turning on auto-login for my user, and then "locking" by trying to bring up a "switch user" screen or something; but really, I'm hoping somebody

a) can help me figure out how to get the desired behavior; or
b) explain why it doesn't work any more (my 12.04 laptop does exactly what I want & honors the settings in the System Settings)