[ubuntu] Lock screen vs. Login screen

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http://ubuntuforums.org – This is certainly not game-changing or life-altering, but a question about Ubuntu has been nagging at me. Why is it that when a user locks the screen (or the screen is locked due to inactivity), the machine doesn't simply go straight to the login screen. The little dialogue that is shown has nothing to offer that the login screen doesn't have. And if the next person to sit down at the machine wants to log in as a different user, they have to click "Switch User" and go through the login screen anyway. While I'm throwing out questions about logging in, does anyone know why it takes (Hardware)