Windows 10: Dual monitors don't wake correctly

Every time I wake my computer, my monitors will go back and forth displaying the login screen. This lasts for maybe 10 seconds. Also, my opened windows all get moved to my main monitor. Is this intended behavior? My secondary monitor is oriented vertically and plugged into my graphics card with an HDMI cable. My primary monitor is oriented horizontally and plugged into my graphics card with a DP cable. I have the latest Windows 10 updates and Graphics drivers, but this issue has been going since I got a second monitor (months).

submitted by /u/infiltraitor37
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:)

 

Dual Monitor Does not wake up from sleep

To further troubleshoot the dual monitor issue, we suggest that you try the following workaround:

• Check the cable connection of your monitor. Try to test if the issue will still persist after using a different cable.
• Change the Turn off the display time in the
  Power Options. We suggest selecting a longer timeframe from the drop-down menu and check if you will still encounter the issue.
• If you are using a USB mouse and keyboard, you can also change its settings and see if it helps. To get started, open the
  Device Manager > locate the mouse/keyboard
  then click it to expand > right-click mouse/keyboard
  and click Properties > Select Power Management
  tab > add a check mark on Allow this device to wake the computer.

Once you have tried all of these, let us know the end result.

 

Dual Monitor Does not wake up from sleep

Hi Doug,

We'd like to ask for additional information about your concern to help us provide the appropriate solution. Please answer the following:

• Have you been experiencing this issue since you started using dual monitors?
• Have you tried to test the second monitor on a different computer to verify if it shows the same behavior?
• May we know how you've set up the Power Options?
• What troubleshooting steps have you tried so far?

We look forward to your response.

 

Dual monitor troubleshooting

I'm trying to troubleshoot a dual-monitor setup and could use some help.

I've spent hours on the phone with Samsung support, and I still don't really know whether it is a hardware or software problem. I sent the monitor to Samsung to repair, and they replaced the PCB, but it's still not working correctly. But their "troubleshooting" capability was limited to telling me to: (1) reset the monitor, (2) unplug and replug it, and (3) try a different cable. None of which inspires confidence.

The monitor works correctly about one time in three. When I get it working, everything is fine. When I don't, it can exhibit any combination of the following symptoms:

• Black screen, no image, monitor's built-in menu may or may not show
• Power light on monitor may be on or off
• Windows may or may not detect the monitor, as reflected in display settings
• Screen may be stretched to the wrong resolution
• Screen may appear at the right resolution, but wallpaper too small for the screen

Generally, when it is not working, it requires a complete restart, unplugging and replugging power and monitor, etc. to get it working correctly. Sometimes I have to do this multiple times.

System details:

• Computer: Lenovo X390
• OS: Windows 10 Pro 1909 18363.693 (recently updated)
• Graphics card: Intel UHD Graphics 620
• Graphics driver: Intel 26.20.100.7528 dated 11/13/2019
• External monitor: Samsung LS24H850QFNXZA 2560x1440
• Monitor driver: Samsung 1.0.0.0 dated 1/5/2017 (the most recent version available on Samsung'g web site, as of today)
• Monitor cable: USB-C

I've already done all the "uninstall and reinstall the driver" sort of things. Can anyone suggest where to go next? I spent the last ten years using only Linux, so my Windows is a bit rusty. Don't even know where to look for error logs, etc.

Any help much appreciated.