Can LightDM greeter blank the screen to save power on laptop?

LightDM would display the greeter (login box) after Lock Screen was activated. The display with the greeter would stay on and I suspect that would chew up battery (I'm using a laptop). Is there any option to get the greeter to go blank after a short while, then a key press would turn back on the login box? I'm running Xfce 4.16 on Mint 20.2.