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How to fix a laptop screen that keeps dimming or brightness keeps changing automatically on Windows 11

Hardware & Peripherals KB-841

Summary

This guide helps you troubleshoot and resolve: How to fix a laptop screen that keeps dimming or brightness keeps changing automatically on Windows 11. Follow the steps below to fix the issue.

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Common Causes

If your Windows 11 laptop screen keeps dimming or the brightness changes automatically, it is usually caused by adaptive brightness or power-saving features. This guide will help you disable these settings so your screen brightness remains consistent.

Quick Fix Steps

  1. Open Settings from the Start menu.
  2. Go to System > Display.
  3. Turn off Change brightness automatically when lighting changes.
  4. Go to System > Power & battery.
  5. Select Best performance under Power mode.
  6. Turn off Battery saver if it is active.

Detailed Instructions

Disable Adaptive Brightness

  1. Click the Start button and select Settings.
  2. In the left-hand menu, click System, then select Display.
  3. Look for the Brightness section.
  4. If you see the option Change brightness automatically when lighting changes, toggle it to Off.

Adjust Power & Battery Settings

  1. In Settings, navigate to System > Power & battery.
  2. Under Power mode, select Best performance to prevent Windows from dimming the screen to save power.
  3. Click on Screen and sleep and ensure your screen timeout settings are configured to your preference.

Disable Battery Saver Mode

  1. Go to Settings > System > Power & battery.
  2. Next to Battery saver, click Turn off now if it is currently active.
  3. Ensure Turn battery saver on automatically if my battery falls below is unchecked or set to a low percentage.

Troubleshooting

Check Manufacturer Power Software

Many laptop manufacturers (such as Dell, HP, Lenovo, or ASUS) include their own power management software that can override Windows settings. Look for a manufacturer utility in your system tray or Start menu and disable any "Eco Mode" or "Adaptive Display" features.

Update Display Drivers

  1. Right-click the Start button and select Device Manager.
  2. Expand the Display adapters category.
  3. Right-click your graphics driver and select Update driver.
  4. Choose Search automatically for drivers.
If you are using an external monitor, brightness controls are managed by the monitor's physical buttons rather than Windows settings.
Avoid disabling adaptive brightness if you frequently work outdoors in varying sunlight, as it helps maintain screen visibility and saves battery life.

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