Windows 10: One monitor of 3 turns on seemingly randomly after Windows puts screens to sleep

I can confirm that Windows successfully cuts the signals to all 3 monitors connected to my PC after the time specified in Power Settings. However, 1 of the 3 is often awake again the next morning. Screen is black, but on and using all the power of the backlight which is basically full power for an LCD monitor. I have seen several reports on the web of a monitor coming back on for a moment, then turning back off, but in my case, it stays on. I'm not sure that it would never go back to sleep, but it seems to me that once it comes back on, it stays that way. I originally thought it was the moni

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Monitor turns on (wakes from sleep) seemingly at random

Hi friends, I have a very... peculiar problem on my (desktop) computer that started just recently.

In my power settings I have set up the monitor to turn off after 15 minutes, and hibernate is disabled (set to "Never").
Like this (it's in norwegian).




This have been working flawlessy since I reinstalled windows about a month ago. But a couple of days ago the montor started to turn itself seemingly at random. The problem is similar to the one describe here, but it also happens during the day.

So I have tried all the usual things:
- Running powercfg -lastwake from command prompt (admin mode). No hits.
- Checked Event Viewer for power-related events.
- Checked the Task Scheduler (disabled all tasks there as well).
- Played around with power settings (disabled wake timers).
- Unchecked “Allow this device to wake the computer” in Device Manger for my LAN and the mouse.
- Uninstalled my Brother Drivers (was the last thing I installed).
- Disable Microsoft OneDrive.
- Done some Voodoo dancing and throwing chicken bones.

But no luck, screen still turns itself on after a while.
BUT: I have tried booting into safe mode, and there it is no problem. The montor turns off and stays off untill I move the mouse or press the keyboard as it should.

Also: when locking windows the monitor stays off, but I would prefer not having to log in every time I want to use the computer.

So I would assume that there is some software or driver sending a signal to the monitor on a regular basis, but which one? Could it be some windows update?

Any answers would be greatly appreciated.

Thanks.

I'm using Windows 10 Pro N, 1909 (OS Build 18363.836).

Here are my startup apps:




- - - Updated - - -

Ok, so I figured what was waking up the monitor: it was the SteelSeries Engine. After I closed it the monitor now sleeps peacefully again.

 

Monitor goes to sleep randomly with windows 10 upgrade

Hi Jaro,

Since you've tried the troubleshooting above, let's proceed to the next troubleshooting steps to further identify the issue. Kindly follow these steps:

• Perform a
  clean boot.
• Use the
  System File Checker tool to repair missing or corrupted system files.
• Always make sure that you have the
  updated version of your operation system.

Let us know the result.

 

Display came back on randomly after Sleep , PC is set to ' Never ' sleep.

I have encountered a weird problem, it's related to Sleep.

I have configured my Power Options

Turn off the Display : 3 minutes

Put the Computer to sleep : Never

after 3 minutes of inactivity, my monitor randomly would turn back on like how ones wake a pc with a mouse , or tap on keyboard. After 3 minutes again, it will turn itself back off.

What could cause this ?