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 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.

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.

- 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.

- 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):
- Press
Win R
and enterregedit
to enter - Positioning to path:
計(jì)算機(jī)\HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\Class\{4d36e968-e325-11ce-bfc1-08002be10318}
- Find
KMD_EnableBrightnessInterface3
andKMD_LEGACYBRIGHTNESSINTERFACE
in this directory - 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.
The above is the detailed content of Screen brightness not working on Windows 10. For more information, please follow other related articles on the PHP Chinese website!

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