The fastest way to adjust brightness

On most Windows 10 laptops, you can change brightness using the keyboard. Look for keys with a sun symbol — usually on the F1 through F12 row. Hold Fn and press the key with the sun getting brighter to increase brightness, or the sun getting dimmer to decrease it. The exact keys vary by laptop brand, but Fn + F11 or Fn + F12 are common.

If your laptop has a touchpad with gesture support, you may also swipe with two fingers to adjust brightness directly. Check your touchpad settings to see if this is turned on.

On a desktop computer with an external monitor, use the physical buttons on the monitor itself — usually on the bottom or side. These buttons open an on-screen menu where you can find brightness settings.

Key Takeaways

  • Laptop brightness usually adjusts with Fn plus a sun-symbol key, often F11 or F12.
  • Windows 10 also has a brightness slider in Settings that works on any device.
  • External monitors have physical buttons to adjust brightness independently of Windows.
  • If keyboard shortcuts do not work, your laptop may need a driver update from the manufacturer.

Using the Windows 10 Settings menu

If keyboard shortcuts do not work, you can adjust brightness through Settings. Click the Start button, then type "brightness" and select "Change brightness settings." This opens the Display settings page.

Scroll down until you see the "Brightness and color" section. You will see a slider labeled "Brightness." Drag it left to dim the screen or right to make it brighter. The change happens immediately.

This method works on any Windows 10 device — laptop, desktop, or tablet — as long as the hardware supports brightness adjustment. Some older or budget monitors do not have this capability, in which case the slider will be grayed out.

The Quick Settings panel for one-click adjustments

Windows 10 has a Quick Settings panel that lets you change brightness without opening the full Settings menu. Press Windows key + A to open it. You will see a brightness slider near the top.

This is the fastest method if you adjust brightness often. The slider works the same way as the one in Settings — drag left to dim, right to brighten. Close the panel by pressing Windows key + A again or clicking elsewhere on your screen.

Adjusting brightness on external monitors

If you use a desktop computer or have connected an external monitor to your laptop, the monitor has its own brightness control separate from Windows. Look for physical buttons on the monitor's bezel — usually at the bottom or along one side.

Press these buttons to open an on-screen menu. Navigate to "Brightness" or a similar option using the arrow buttons, then adjust the value. The exact menu layout depends on your monitor brand, but the process is similar across most models.

Adjusting the monitor directly is often better than using Windows settings because it gives you finer control and does not drain your laptop battery if you are running on power.

What to do if brightness controls do not work

If the keyboard shortcut does not change brightness, your laptop may be missing or have outdated display drivers. Visit your laptop manufacturer's support website — Dell, HP, Lenovo, Asus, and others have driver download pages — and search for your exact model number. Download and install the latest display or chipset driver, then restart your computer.

If the Windows Settings slider is grayed out, your monitor or graphics card does not support brightness adjustment through Windows. This is common on older external monitors or budget displays. In this case, use the physical buttons on the monitor itself.

If you have recently updated Windows 10 and brightness controls stopped working, restart your computer first. If that does not fix it, check Device Manager for any devices with a yellow warning triangle — right-click and select "Update driver" to fix driver conflicts.

Brightness and blue light settings

Windows 10 also includes a Night light feature that reduces blue light in the evening, which some people find easier on the eyes. This is separate from brightness adjustment. To turn it on, go to Settings > System > Display and toggle "Night light" to on.

You can set a schedule so Night light turns on and off automatically at specific times, or turn it on manually whenever you want. The "Color temperature" slider lets you control how much orange tint the screen gets — more orange means more blue light filtered out.

Night light does not replace brightness adjustment; it works alongside it. You can have the screen dimmed and have Night light on at the same time.

Frequently Asked Questions

Why is my brightness slider grayed out in Settings?

Your monitor or graphics card does not support brightness control through Windows. This is normal for some external monitors and older displays. Use the physical buttons on your monitor instead, or check your monitor's manual to see if it has a software control panel.

Can I set brightness to turn on and off at certain times?

Windows 10 does not have automatic brightness scheduling built in. However, you can use the Night light feature with a schedule to reduce blue light at specific times. For full brightness automation, you would need third-party software or a monitor with its own scheduling feature.

Does adjusting brightness save battery on a laptop?

Yes, lowering brightness reduces power consumption and extends battery life, sometimes by an hour or more depending on how much you dim it. Dimming the screen is one of the most effective ways to make a laptop battery last longer during the day.

What if my monitor has no buttons and is not adjustable?

Some budget monitors and older displays do not have brightness controls at all. In this case, adjust brightness through Windows Settings instead. If the slider is grayed out there too, your only option is to use your graphics card's control panel — right-click your desktop and look for "Graphics Settings" or "Display Settings."