Did you test that setting every pixel black actually triggers this? Most OS just shut the monitor after inactivity (by ceasing to output video signal, or something like that).

Ahh maybe you are referring to dynamic contrast (which is still a misfeature).

> What's dynamic contrast?

Shutting certain backlights to raise the contrast between the dark side of the screen and the lit side. It has various undesireable side effects such as the darkening and lightening giant areas unexpectedly. They often try to make the transition gradual which just makes the screen even less real-time.

No, it takes around 200ms for it to turn back on.

> Shutting certain backlights to raise the contrast between the dark side of the screen and the lit side.

Ah, no, there are no sections in this one, the whole backlight turns off and on.