Night light not working (grayed-out button)
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Symptom
Section titled “Symptom”In Settings → System → Display → Night light the toggle button is greyed out: it cannot be clicked, and the schedule and “Night light color temperature” are unavailable. The feature does not turn on either manually or on a schedule.
Typical causes
Section titled “Typical causes”The component responsible for Night light is damaged — usually after a major Windows update, the application of tweaks and “optimizers”, or a failure that interrupted an update. Sometimes the cause is a video adapter driver that lost the required feature after an update.
Fix in BoosterX
Section titled “Fix in BoosterX”- Open BoosterX → the “Fixes” section (in the left menu).
- In the search, type “Night light”.
- Open the card “Night light 1 (grey toggle button)” and click “Fix”.
- Restart Windows — without a restart the button may remain grey.
The fix eliminates the cause that blocks the button and returns it to a working state. BoosterX can be downloaded from the official website boosterx.org.
How to verify
Section titled “How to verify”Open Settings → System → Display → Night light again: the button should be clickable. Turn it on — the screen will smoothly acquire a warm tint (immediately or at the set time, if a schedule is configured). After checking, turn Night light back off.
Manual alternative without BoosterX
Section titled “Manual alternative without BoosterX”Install all updates: Settings → Windows Update → Check for updates, then restart. If the button remains grey, update the video adapter driver: Device Manager → Display adapters → right-click the adapter → “Update driver”. It is more reliable to install a fresh driver from the video card manufacturer’s website.
If that did not help
Section titled “If that did not help”If the button started working but Night light itself still does not turn on, try the second card in the same section — “Night light 2 (the button works, but the feature itself does not)”: it resets the saved state and Night light parameters to their default values. Further diagnostics using the Windows event log are performed by EventX; if the problem persists, write to support.
Last checked: 2026-09-20. Full catalog of fixes.