The fastest way to adjust brightness

On most Windows 11 laptops and tablets, you can change brightness using the keyboard shortcut Fn + brightness keys. Look for keys with a sun symbol — usually on the F1 through F12 row. Hold Fn and press the key with the dimmer sun to lower brightness, or the brighter sun to raise it. The brightness bar appears on screen as you adjust, so you can see the change in real time.

If your keyboard does not have brightness keys, or if you are using a desktop monitor, use the Settings menu instead. Press Windows key + I to open Settings, then go to System in the left sidebar and select Display. Scroll down to find the brightness slider under "Brightness and color" and drag it left to dim or right to brighten.

Key Takeaways

  • Keyboard brightness keys (Fn + sun symbol) work when ready on most laptops and are the quickest method.
  • The Settings menu path is Windows key + I, then System, then Display, where you will find the brightness slider.
  • Desktop monitors connected to Windows 11 may have brightness controls on the monitor itself rather than in Windows.
  • If the brightness slider is missing or grayed out, your display driver may need an update from Device Manager.
  • Adaptive brightness can turn on automatically in Settings and will dim your screen based on ambient light.

Using the Settings brightness slider

Open Settings by pressing Windows key + I. In the left sidebar, click System. Then click Display in the menu that appears. You will see "Brightness and color" near the top of the page, with a slider underneath it. Drag the slider to the left to lower brightness or to the right to raise it. The change takes effect when ready.

If the slider appears grayed out or is missing entirely, your display driver may not be installed correctly. Go back to Settings, click System, then About, scroll down, and click Advanced system settings. In the window that opens, click Device Manager. Find Monitors in the list, click the arrow next to it to expand, right-click your monitor name, and select Update driver. Windows will search for the latest driver and install it automatically.

Adjusting brightness on external desktop monitors

If you are using a desktop monitor plugged into a Windows 11 computer, the brightness control is usually on the monitor itself, not in Windows. Look for physical buttons or a menu dial on the bottom or side of the monitor. Press the menu button to open the on-screen display, then use the arrow buttons to navigate to brightness or backlight. Adjust the value and press menu again to close.

Some newer monitors have a USB connection to your computer and may have Windows software to control brightness remotely. Check the monitor's manual or the manufacturer's website to see if a control app is available. If you installed one, you can often find it in Settings under Apps and Installed apps, or search for it in the Start menu.

Turning on adaptive brightness

Adaptive brightness automatically dims your screen when the room is dark and brightens it when the room is lit. This can reduce eye strain and save battery power on laptops. To turn it on, open Settings with Windows key + I, go to System, then Display. Scroll down to "Brightness and color" and toggle Adaptive brightness to on.

Adaptive brightness works only if your device has an ambient light sensor — most modern laptops have one, but desktop monitors typically do not. If the toggle is missing or grayed out, your device does not have a sensor. You can still adjust brightness manually at any time, even when adaptive brightness is on.

Fixing brightness controls that are not working

If the brightness slider does not appear in Settings, or if keyboard brightness keys do nothing, the display driver is usually the problem. Open Settings, go to System, then About. Scroll down and click Device Manager. Look for Monitors in the list and click the arrow to expand it. Right-click your monitor and select Update driver. Choose "Search automatically for updated driver software" and wait for Windows to finish.

If updating the driver does not work, try uninstalling it and restarting your computer. In Device Manager, right-click your monitor and select Uninstall device. Restart Windows. When your computer boots up, Windows will automatically reinstall the driver. This often fixes brightness controls that have stopped responding.

On some laptops, brightness keys may be disabled in the BIOS or by a manufacturer utility. Restart your computer and enter BIOS setup (usually by pressing Delete, F2, or F10 during startup — check your laptop manual). Look for a setting called "Integrated Peripherals" or "Onboard Devices" and make sure the keyboard controller or embedded controller is enabled. Save and exit.

Common mistakes to avoid

Do not confuse the brightness slider with the volume slider — they are separate controls in Settings. The brightness slider is under "Brightness and color" in the Display section, while volume controls are in System and then Sound.

If you are using a laptop and the brightness keys do not work, make sure you are holding the Fn key. Some laptops require Fn to be held down; others have a Fn Lock key that toggles whether Fn is needed. Check your laptop manual if brightness keys are not responding.

On desktop monitors, do not look for brightness controls in Windows Settings — they are on the monitor itself. If you cannot find physical buttons, check the monitor's manual or look for a small menu button near the power button.

Frequently Asked Questions

Why is my brightness slider grayed out in Settings?

A grayed-out brightness slider usually means your display driver is missing or outdated. Open Device Manager (right-click the Start button and select it), expand Monitors, right-click your monitor, and select Update driver. Windows will search for and install the latest version automatically.

Can I set different brightness levels for different times of day?

Windows 11 does not have a built-in schedule for brightness changes, but you can use adaptive brightness to adjust automatically based on room lighting. Some laptops include manufacturer software that allows scheduled brightness changes — check your laptop maker's support page to see if an app is available.

My keyboard brightness keys do not work. What should I do?

First, make sure you are holding the Fn key while pressing the brightness keys. If that does not work, update your keyboard or chipset driver in Device Manager. Right-click the Start button, select Device Manager, expand Keyboards, right-click your keyboard, and select Update driver.

Is there a way to lock brightness so it does not change accidentally?

Windows 11 does not have a brightness lock feature, but you can turn off adaptive brightness to prevent automatic changes. Open Settings, go to System and Display, and toggle Adaptive brightness to off. After that, brightness will only change when you manually adjust the slider or use keyboard keys.

Can I control brightness on an external monitor from Windows?

Most external monitors have physical controls on the monitor itself. Some newer monitors with USB connections include software that lets you control brightness from Windows — check the monitor's manual or the manufacturer's website to see if a control app is available for your model.