Windows 10: Display does not turn off automatically in Windows 10 2004. How to troubleshoot?

After upgrading to Windows 10, version 2004, the screen on my desktop no longer turns off after a set period on inactivity. This worked just fine before.


It does not matter which power plan I've selected currently 'High Performance' - but this setting should not have any effect on the display turning off, nor the amount of delay I've the defined in the 'Power & sleep' settings.


If I set the whole computer to sleep, this works and the display is turned off as well. So there is no problem with the suspend/sleep itself. It is only the display turning off which does not work.


Executing this PowerShell script turns off the display, but it immediately turns back on:

# Turn display off by calling WindowsAPI.

# SendMessageHWND_BROADCAST,WM_SYSCOMMAND, SC_MONITORPOWER, POWER_OFF
# HWND_BROADCAST 0xffff
# WM_SYSCOMMAND 0x0112
# SC_MONITORPOWER 0xf170
# POWER_OFF 0x0002

Add-Type -TypeDefinition '
using System;
using System.Runtime.InteropServices;

namespace Utilities {
public static class Display
{
[DllImport"user32.dll", CharSet = CharSet.Auto]
private static extern IntPtr SendMessage
IntPtr hWnd,
UInt32 Msg,
IntPtr wParam,
IntPtr lParam
;

public static void PowerOff
{
SendMessage
IntPtr0xffff, // HWND_BROADCAST
0x0112, // WM_SYSCOMMAND
IntPtr0xf170, // SC_MONITORPOWER
IntPtr0x0002 // POWER_OFF
;
}
}
}
'


On Linux, running


xset dpms force off


works as expected and the display does not turn back on until activity, so it is not a hardware issue.


How do I troubleshoot this on Windows? How can I see which process turns on the display? The 'Power troubleshooter' is useless. And so is the 'powercfg' utility - as I cannot see anything related to the display specifically in it. As I describe above, 'sleep/suspend' works, 'turning off the display' does not. And yes, I have the latest drivers installed.

:)

 

Windows 10 infinite restart black screen


The tutorials provided are just a list of troubleshooting steps. Use only the steps which apply to you.

Since none of the troubleshooting steps here worked, I'd suggest you do a Clean install.

John

 

Windows automatically turns on

Hi,

I realize that you are facing the issue with the power options in Windows 10, let me assist you.

As an initial step of troubleshooting, I suggest you to run the power troubleshooter and check if it helps.

The power troubleshooter can automatically detect and fix any incorrect power settings. Refer to these steps to run this troubleshooter:

• Type troubleshooting in the search bar and click on
  Troubleshooting.
• Select the View all option on the left pane.
• Click on Power troubleshooter and follow the on-screen instructions.

If the issue persists, try changing the Power button settings and check if it helps.

• Press Windows key + X key and select
  Power options.
• Click on Choose what the power button does in the left pane.
• Select the appropriate option from the drop down menu and check if it helps.

Hope this helps. Kindly write back to us with the updated status of the issue for further assistance, we will be glad to assist you.

 

Windows automatically turns on

Well, it doesn't work. I have to shut it down twice to work...