How to let Windows 11 Change Brightness Automatically when Lighting Changes

Why Use Automatic Brightness?

Windows 11 auto brightness makes your screen comfortable to view in any illumination, preserving battery life on laptops and reducing eye strain.

Windows 11 automatically adjusts screen brightness based on room lighting. The operating system monitors ambient light conditions (surrounding illumination levels), meaning you never need to touch the brightness slider manually.

How to Set Up Automatic Brightness

Step 1Go to Display Settings

Open the main Settings app ⚙️ by clicking the Start button ⊞ on your taskbar 🖥️ and selecting the gear icon. Choose System on the left side of the window, and then click Display.

1. Click the Start button ⊞. It’s usually in the middle of your screen at the bottom.
2. Click the Settings icon. It looks like a little gear.
3. On the left side of the Settings ⚙️ window, click on System.
4. In the System settings, click on Display.

Step 2Find the Brightness Control

Scroll down the Display menu until you find the option labeled 'Change brightness automatically when lighting changes'. Windows 11 includes a 'Brightness' slider that lets you manually adjust your screen's light. To get automatic brightness, find and turn on a specific setting that uses your computer's light sensor.

Windows 11 has a 'Brightness' slider for manual adjustments. To enable automatic brightness control, locate and activate the specific setting. It uses light sensor data to adjust screen brightness based on surrounding light levels for a better viewing experience.

Step 3Turn On Automatic Brightness

Scroll down the Display menu until you find the option labeled 'Change brightness automatically when lighting changes'. Click the toggle switch next to it to turn it 'On', and your PC will then adjust the screen brightness based on the room's light.

Look for a setting labeled "Change brightness automatically when lighting changes." You'll likely see this as a checkbox or a toggle switch.

If you see this option: That indicates your computer has the necessary hardware, like a light sensor, and the right software.

Turn this setting on by clicking the checkbox or flipping the switch to 'On.' When enabled, Windows uses your computer's sensors to monitor the surrounding light. Your screen will dim in darker conditions and brighten when it's lighter, all working quietly in the background.

Step 4How it Works

Windows 11 auto brightness uses your computer's light sensor to adjust the screen. This sensor detects the light in your room and changes the screen brightness so it's comfortable to see. For regular screens, Windows finds a balance between too dim and too bright, while HDR screens get a different kind of adjustment.

For Normal Screens: Windows tries to make your screen easy to see no matter how bright or dark your room is. It finds a balance so it's not too dim or too bright.

For HDR (High Dynamic Range, a technology that expands contrast and color accuracy) screens, Windows adjusts brightness to better match how human eyes perceive light changes. This HDR screen brightness adjustment may proceed slightly slower for a more natural viewing experience.

Reference:

https://support.microsoft.com/en-us/windows/change-display-brightness-and-color-in-windows-3f67a2f2-5c65-ceca-778b-5858fc007041#category=windows_11

Summary

Windows 11 auto brightness uses sensors to adjust your screen's light automatically, making it easier to see and saving power.