Windows 10: Computer doesnt immediately go to sleep if plugged into external monitor. Why!

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Windows 10 sleeps when using external monitor and closing the laptop lid.

Hey Likitha

Thanks for your response.

Before we assist further, I would like to ask you a few questions:

• Have you set Sleep function to activate on closing the laptop lid?
• Did you check if the laptop goes to sleep when not connected to external monitor and lid closed?

To respond to your questions

(1) I have set the sleep function to operate on laptop lid close only when the laptop is on battery power. When it is plugged in I have set it to do not sleep ever.

(2) I have tested that it does *not* go to sleep when I the laptop is plugged in and I close the laptop lid

Further information:

(1) When I first turned the laptop on I attached it to the monitor and closed the lid. It then ran successfully for approximately an hour before hibernating.

(2) I then restarted the system, external monitor plugged in, lid closed and it went to hibernate after approximately 2 minutes.

 

Computer not sleeping with second monitor plugged in

I was hoping someone might be able to shed some light on a weird quirk that I have been having and I can not for the life of me figure out how to solve this. I have a Radeon RX 570 graphics card that I run 2 monitors off of. My main display seems to function
just fine where as my computer will go to sleep when it’s supposed to and all is well, but for some reason when my second display is plugged in the computer will not sleep regardless of what power settings are set. All monitors will sleep but the computer
will not. I can’t find any settings that might be preventing this.

 

After waking from Sleep Windows does not detect two external monitors

Hi Arifeen,

As per your description, I understand that when your PC goes to Sleep the two external monitors that are attached to your PC do not wake. Upon reboot, the setting personalized in the other two monitors are lost which enforces you to re-set the settings.

The issue is most likely with the graphics driver. Whenever a single monitor is disconnected from a multimonitor setup in Windows, Windows will attempt to move everything from that screen onto the remaining screen(s). Usually, this will not occur when
suspending/hibernating/shutting down the computer. Thus, it is probably because of the graphics driver doing one of the following:

• 'Disconnecting' the monitors when you put the computer to sleep, so when Windows awakens, it must re-determine where to place everything.
• Recognizing the monitors in a different order each time you bring the computer out of sleep, forcing Windows to rearrange your application windows.

To rectify the above, I suggest that you open Windows Update and check if there are any pending updates related to your PC as well as your graphic card driver. If so, disconnect all external devices other than mouse and keyboard, install the updates and
check.

If the above did not help, then I suggest that you uninstall your graphic card driver and re-install the latest driver update available from the manufacturer's website. To learn how to perform the same, refer to the steps outlined in the link below

How to: Install and Update drivers in Windows 10

Hope this helps

Regards