Night mode cannot adjust the color temperature or does not take effect, which is usually caused by system settings or driving problems. First check whether night mode is actually enabled: Go to Settings > System > Display, confirm that the "Night Mode" switch is on. If the gray is not selected, it may be a problem with the graphics card driver or system version; secondly, if the color temperature adjustment is invalid, you can try restarting the Explorer, use the registry to repair, reset the night mode settings, and turn off the conflicting third-party software; finally check the time and geographic location permissions: Ensure that the location is allowed in the privacy settings, and enable the automatic time and time zone setting function.

The problem that Windows night mode cannot adjust the color temperature or does not take effect at all is encountered by many users. This problem is usually not a hardware problem, and it is likely that something is wrong with the system setup or driver.

Check if night mode is enabled

Many people think that night mode is turned on, but in fact, it is just setting the automatic turn on time, but the function itself is not turned on. You can check this way:

• Open Settings > System > Display
• Scroll down to find the "Night light" setting
• Make sure the switch is on

If the gray color is not optional, it may be that there is a problem with the graphics card driver, or the system version is too old. It is recommended to update Windows to the latest version and confirm that your graphics card driver supports the current system environment.

Is the color temperature adjustment invalid? Try these methods

Sometimes, even if Night Mode is enabled, the sliding color temperature bar does not change at all. This may be caused by system cache or service exceptions.

You can try the following methods:

• Restart Explorer: Press Ctrl Shift Esc to open Task Manager, find "Windows Explorer", right-click and select "Restart"
• Use Registry Repair (for Advanced Users): Navigate to HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\WindowsUpdate\Auto Update in Registry Editor to check for exceptions
• Reset Night Mode settings: Turn off Night Mode on the "Display" settings page, then log out and log in again, and turn on again

In addition, some third-party software (such as f.lux or eye protection tools) may conflict with the night mode that comes with Windows. It is recommended to temporarily close or uninstall them to test it.

Check time and geolocation permissions

Night mode relies on the system's time and geographical location to determine sunrise and sunset times. If you find that it is not automatically turned on on time, it may also be that these two permissions are disabled.

• Go to Settings > Privacy > Geography
• Make sure "Location Access to this device" is on
• Go to Settings > System > Time and Language > Date and Time
• Confirm that "Automatic Set Time and Time Zone" is on

Without the correct geolocation information, night mode cannot accurately determine when to enable it, which is one of the reasons why some people set automatic on but does not work.

Basically, these common causes and solutions are all there. Not a big problem, but it is easy to ignore the settings details.

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