Two monitors connected to the graphics card: one via HDMI, the other via DisplayPort.
When Windows turns off the monitors after a time specified in the power profile of the first monitor just goes out, and the second writes on the screen that there is no signal.
How to make both monitors shut down?
I guess you need to take the same monitors (not just one manufacturer, for example Dell, but quite the same). In fact, both monitor when you programmatically disable (i.e., removal of a signal) do not remove the food and go into hibernation, and the difference in how this process looks, is due only to program stuffing their controllers. If it is the same, there's no reason to neodnorodnosti.
However, if they have their own configurable OSD menu, then the difference may be caused by a difference in these settings.
Would you mind telling me why you need such a strict simultaneous extinction? In my opinion, there's no practical sense. Tried to dream up on this subject, but to no avail.
Hertha_Lesch answered on April 19th 20 at 12:27
If the monitors are the same, try to swap the connection type, what happens?
Perhaps the scaler reacts differently to different signal sources
Try changing the HDMI cable, perhaps it does not pass through the switch-off signal