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Table of Contents
Check whether the graphics card driver is normal
Adjust the brightness settings in the power plan
Modify the registry (for certain specific situations)
Use third-party tools as temporary alternatives
Home Computer Tutorials Troubleshooting Screen brightness not working on Windows 10

Screen brightness not working on Windows 10

Jul 13, 2025 am 01:07 AM
screen brightness

When the screen brightness adjustment is invalid, first check and update the graphics card driver, especially the Intel integrated graphics card device; secondly, adjust the display brightness settings in the power supply options to ensure that both the battery and plug-in state can be adjusted; if it is invalid, try to modify the registry-related items (backup is required before operation); finally, use third-party tools such as Dimmer or ClickMonitorDDC to temporarily adjust the brightness. 1. Update or reinstall the graphics card driver; 2. Modify the brightness settings in the power plan; 3. Adjust the registry parameters; 4. Use third-party brightness adjustment software.

Screen brightness not working on Windows 10

Screen brightness adjustment does not work, which is one of the common problems encountered by Windows 10 users. Especially on laptops, this problem may lead to a significant discount in user experience. When this happens, it may involve multiple aspects such as driver, power management, or system settings.

Screen brightness not working on Windows 10

Check whether the graphics card driver is normal

In many cases, the brightness cannot be adjusted because there is a problem with the graphics card driver. Especially for Intel integrated graphics devices, once the driver is abnormal, the brightness slider may disappear or be unable to be adjusted.

Screen brightness not working on Windows 10
  • You can try to update or reinstall the graphics card driver:
    • Open Device Manager
    • Expand "Show Adapter" and right-click on your graphics card (such as Intel HD Graphics)
    • Select Update Driver or Uninstall Device
    • After uninstalling, restart the computer, the system will automatically reinstall the driver

If you are not sure whether the current driver is the latest, you can also download the corresponding driver model to install it manually on the official website.


Adjust the brightness settings in the power plan

Sometimes brightness control is limited to power management, especially with different settings when using a battery or plug-in state.

Screen brightness not working on Windows 10
  • Open Control Panel > Power Options
  • Click "Change Plan Settings" next to the currently used power plan
  • Click "Change Advanced Power Settings" again
  • Find "Show" > "Adjust display brightness" in the pop-up window

Check whether the brightness values in these two states are set to the same or whether they are locked on a fixed value. If locked, you can try to modify it to an adjustable state.


Modify the registry (for certain specific situations)

If the above method is invalid, it may be that the brightness adjustment item in the system registry is disabled. This usually happens after some branded machines or upgraded systems.

The operation steps are as follows (note: there are certain risks in modifying the registry, please back up first):

  1. Press Win R and enter regedit to enter
  2. Positioning to path:
    計(jì)算機(jī)\HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\Class\{4d36e968-e325-11ce-bfc1-08002be10318}
  3. Find KMD_EnableBrightnessInterface3 and KMD_LEGACYBRIGHTNESSINTERFACE in this directory
  4. Change their values to 0

After completion, restart the computer to see if the brightness adjustment returns to normal.


Use third-party tools as temporary alternatives

If you don't want to mess with the system settings or drivers, you can also use some lightweight third-party software to manually adjust the brightness, such as:

  • Dimmer : an open source gadget that supports transparency and brightness adjustment
  • ClickMonitorDDC : Suitable for external monitor users, through which the brightness of the monitor itself can be adjusted

Although these tools cannot solve the fundamental problem, they can at least allow you to continue to use them normally during the troubleshooting process.


Basically these common ways of dealing with it. Some problems will only take effect after restarting, so don't forget to try restarting the system.

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