Windows 10 brightness slider not working [Completely fixed]

Milan Stanojevic
by Milan Stanojevic
Deputy Editor
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  • Your computer brightness settings play an important role in reducing eye strain and extending your device's battery life.
  • You can change your display brightness settings any time you want to suit your needs.
  • However, sometimes the brightness level may fail to change. If you're experiencing the same problem, this guide is for you.
  • This guide is part of WindowsReport's larger Windows 10 Troubleshooting Hub. Feel free to bookmark it for more useful tips and tricks.
laptop brightness issues

Brightness issues on your computer are usually associated with display drivers, and other power settings, which you may or may not be aware of.

If Windows won’t let you adjust brightness on your PC or laptop, these are the first two areas to check for besides trying the usual common fixes such as restarting your computer or updating Windows.

While updating Windows will work to install the latest drivers that could be pending on the updates tray, there are other solutions you can try that are listed below and see if that helps you get back the proper resolution and brightness for your machine.

Keep in mind that every model of your laptop, as well as operating systems, are different, even as you check on the settings for each fix.


We’ve written extensively about black screen issues before. Bookmark this page in case you need it later.


What to do if laptop brightness won’t change / slider not working?

  1. Update Display Adapter drivers
  2. Enable adaptive brightness
  3. Enable PnP Monitor
  4. Update the registry

1. Update Display Adapter drivers

  1. Right click Start and click Device Manager.
    device manager screen brightness not working windows 8
  2. Expand Display Adapters.
    display drivers Windows won’t let me adjust screen brightness
  3. Right-click on the Display Adapter listed and click on Update Driver Software.
  4. Select the option to automatically search for the updated driver software.
  5. Restart the computer after its updated and verify.

Learn everything there is to know about updating drivers from our complete guide!


You can also try and get the latest drivers from your computer’s manufacturer website and download and install the latest display and chipset drivers. To do this:

  1. Right click Start
  2. Select Device Manager
  3. Search for Display driver and click on it to expand the list
  4. Right click on the specific display driver
  5. Select Uninstall
  6. Go to the Software and Drivers sub-section (depending on the laptop brand this name can change), or search for drivers using Google so you can get a direct link to your device’s manufacturer website.
  7. Once you’re on the website, find and download

Install the appropriate drivers missing from your laptop that can cause the brightness adjustment problem.


2. Enable adaptive brightness

  1. Click Start and select Control Panel
  2. Select Power Options
    power options control panel Windows won’t let me adjust screen brightness
  3. Click the Change plan settings link next to your current power plan
    balanced power plan screen brightness not working windows 8
  4. Click Change advance power settings
    change advanced power settings how to adjust brightness in windows 7 pc
  5. In the new window click Display to open up the listings under it.
  6. Find and click each of the following…Display brightness, Dimmed display brightness and Enable adaptive brightness
  7. Change each of these to the desired settings
  8. Click Apply
  9. Click OK

3. Enable PnP Monitor

  1. Right-click on Start and select Device Manager
  2. Click Monitors
    device manager monitors Windows won’t let me adjust screen brightness
  3. Right-click on Generic PnP monitor to see if it is enabled
    generic pnp monitor screen brightness not working windows 8
  4. If not enabled, click Enabled device. If it is enabled, disable it
  5. Click on Action tab at the top menu of Devices Manager
    action menu device manager how to adjust brightness in windows 7 pc
  6. Select Scan for Hardware Changes
    scan for hardware changes can't adjust screen brightness
  7. Run the scan

4. Update the registry

If you’re still unable to adjust brightness on your laptop, try updating the registry.

Note: This solution contains steps that are part of modifying the registry. Please note that serious problems may occur if you do this incorrectly. Ensure you follow these steps correctly, and carefully.

Back up the registry before you modify it, then restore it if a problem occurs.

To do this:

  1. Right-click on Start and select Run
    run window Windows won’t let me adjust screen brightness
  2. Go to HKEY_LOCAL_MACHINE

  3. Click System
  4. Click ControlSet001
  5. Click Control
  6. Select Class{4d36e968-e325-11ce-bfc1-08002be10318}000 and set FeatureTestControl DWORD’s value data to 0000ffff

Can’t access Registry Editor? Things aren’t as scary as they seem. Check out this guide and solve the issue quickly.


If this issue persists, you should also ask for a specialist’s help. If your screen is faulty, updating your drivers won’t solve the problem.

If the display is affected by hardware issues, then most likely, you’ll need to get a new display.

If you’re still having trouble adjusting brightness on your Windows 10 computer, post a comment in the section below and let us know the details.

Editor’s Note: This post was originally published in May 2018 and has been since updated for freshness, and accuracy

FAQ: Learn more about your PC’s brightness settings

  • How do I turn down the brightness on Windows 10?

To reduce the brightness on Windows 10, open the Settings App, go to System and then click on Display. Locate the Change brightness slider and move it to the left to turn down the brightness level.

  • What is the ideal brightness of the monitor?

Ideally, the best brightness level for monitors is anywhere between 300 to 350 cd/m2. Keep in mind that extra brightness is required in well-lit environments but too much brightness can lead to tired eyes.

  • What is the shortcut key for brightness?

On most modern-day laptops, pressing the Fn key and then the F11 or F12 keys can be used to adjust the brightness settings directly from the keyboard.

Editor’s Note: This post was originally published in April 2019 and has since been updated for freshness and accuracy.

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