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How to Fix an HDMI External Monitor That Is Not Detected After Sleep Mode on Windows 10 and 11

Hardware & Peripherals KB-938

Summary

This guide helps you troubleshoot and resolve: How to Fix an HDMI External Monitor That Is Not Detected After Sleep Mode on Windows 10 and 11. Follow the steps below to fix the issue.

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Common Causes

How to Fix an HDMI External Monitor That Is Not Detected After Sleep Mode on Windows 10 and 11

It is common for Windows 10 and 11 devices to lose connection with an external HDMI monitor after waking from sleep mode. This usually happens because the graphics driver enters a low-power state and fails to re-initialise the external display. This guide provides steps to restore your monitor connection and prevent the issue from recurring.

Quick Fix Steps

  1. Restart your computer to refresh the graphics driver and display connection.
  2. Check that the HDMI cable is firmly plugged into both the computer and the monitor. Inspect the cable and ports for any visible damage.
  3. Press Windows key + P to open the Project menu.
  4. Select Duplicate or Extend to force Windows to detect the display.
  5. If the monitor remains blank, turn the monitor off and on again.

Detailed Instructions

1. Manually Detect the Display

  1. Right-click on the desktop and select Display settings.
  2. Under the Multiple displays section, click the Detect button.
  3. Wait for Windows to search for connected displays.

2. Update or Roll Back Graphics Drivers

  1. Right-click the Start button and select Device Manager.
  2. Expand the Display adapters category.
  3. Right-click your graphics card and select Update driver.
  4. Choose Search automatically for drivers and follow the prompts.
  5. If the issue started after a recent update, select Properties, go to the Driver tab, and click Roll Back Driver if available.

3. Adjust Power Management Settings

  1. Right-click the Start button and select Device Manager.
  2. Expand Display adapters, right-click your graphics card, and select Properties.
  3. Go to the Power Management tab.
  4. Uncheck Allow the computer to turn off this device to save power.
  5. Click OK to save the changes.

4. Change Sleep Settings

  1. Open Settings and go to System > Power & sleep (Windows 10) or System > Power & battery (Windows 11).
  2. Adjust the Screen and Sleep timers to prevent the system from sleeping too quickly.
  3. Click Additional power settings to open the Control Panel.
  4. Select Change plan settings next to your active plan.
  5. Click Change advanced power settings.
  6. Expand PCI Express > Link State Power Management and set it to Off.
Tip: If you are using a docking station or HDMI adapter, ensure it is connected directly to the laptop and not through an unpowered USB hub, as this can cause detection failures after sleep.
Caution: Avoid disconnecting or reconnecting HDMI cables while the computer is in sleep mode, as this can occasionally cause the graphics driver to crash.

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