You're right I don't really know exactly what the setting does. But if a video cannot play with the black in the video being the darkest black my monitor is ca

You're right I don't really know exactly what the setting does. But if a video cannot play with the black in the video being the darkest black my monitor is capable of, there is a problem there. Maybe it's some inherent problem with standards or formats or something. But if a video wants to show black, it should display on my monitor as dark as the monitor supports.