Night Light Not Working in Windows 11? 9 Fixes That Work (2026)

🌙

Windows 11 Night Light

Not Working / Greyed Out

Laptop & Desktop

Typical fix time (editor's estimate)

3 – 20 min

Difficulty: Beginner to Intermediate | Data risk: none

✅ Files stay safe🔧 Built-in tools only⚠️ Export registry first🛑 Skip registry cleaners

Match my symptom Greyed out? Go to the reset

1 min

Start here: the 1-minute check

1) Press Win + A and try the Night light tile. 2) Open Settings > System > Display > Night light. 3) Is the switch greyed out, or does it turn on but nothing changes? That one answer decides which section you need.

What's In This Guide

1. Quick Overview 2. Symptom & Cause Finder 3. Basic Settings Check 4. Location, Time & Schedule 5. Display Driver Fix 6. HDR, Color & Monitors 7. Registry Reset 8. Stuck On or Won't Turn Off 9. Updates & System Repair 10. Fixes Compared 11. Effort vs. Risk 12. Do's and Don'ts 13. Which Fix For You 14. Prevent It Returning 15. Final Summary 16. FAQ

Night Light Not Working in Windows 11? 9 Fixes That Work

01. Quick Overview: Night Light Problems at a Glance

📌 Windows 11 Night Light: Complete Summary

Item	Details
What it does	Shifts screen color warmer to reduce blue light, manually or on a schedule
Where to find it	Settings > System > Display > Night light, or Win + A quick settings
Common causes	Display driver problems, location or time settings, HDR, a corrupted settings cache, monitor or dock limits
Driver limits	Some DisplayLink and Basic Display drivers don't support Night Light
Most reliable last fix	Export, then delete the two Night Light registry subkeys and restart
Skills needed	Opening Settings and Device Manager; Registry Editor for step 7

⚙️

Check

Toggle, strength, schedule

📍

Verify

Location, date and time

🖥️

Driver

Update or reinstall

🧹

Reset

Clear cached settings

02. Symptom and Cause Finder

🚨 Match What You See

What You See	Likely Cause	First Fix
Night light switch greyed out	Display driver or corrupted settings cache	Sections 5 and 7
Schedule option greyed out	Location services off or wrong time zone	Section 4
Turns on but no color change	Strength at 0, HDR, or monitor color override	Sections 3 and 6
Won't turn off, or turns on by itself	Stuck state in saved settings, or a schedule	Sections 8 and 7
Works on laptop screen, not external monitor	Dock, adapter or driver doesn't pass color changes	Section 6
Broke after a Windows update	Driver mismatch or cache issue	Sections 5 and 9
Red tint only in HDR content	Night Light combined with HDR	Section 6

03. Basic Settings Check

⚙️ Rule Out the Simple Stuff First

Open Night light settings. Go to Settings > System > Display > Night light.
Turn it on manually. Use Turn on now, or press Win + A and click the Night light tile.
Raise the Strength slider. At a low value the change is barely visible, so drag it toward the middle.
Turn the schedule off and on again. Disable the schedule, enable Night light manually, then re-enable the schedule.
Restart Windows. A full restart, not just sleep, clears many temporary display glitches.

04. Location, Date and Time Settings

📍 Why the Sunset-to-Sunrise Schedule Fails

📍

Location services

With location off, the sunset to sunrise schedule can be unavailable. Turn it on in Settings > Privacy & security > Location.

🕒

Date, time and time zone

Wrong values can grey out or shift the schedule. Enable "Set time automatically" and "Set time zone automatically".

⏰

Use set hours

If you don't want location on, choose "Set hours" and enter your own start and end times.

05. Display Driver Fix

🖥️ Night Light Depends on Your Graphics Driver

Check the adapter name. Right-click Start > Device Manager > Display adapters. "Microsoft Basic Display Adapter" means no proper driver is installed.
Update the driver. Right-click the adapter > Update driver. Better, install the latest driver from Intel, AMD, NVIDIA or your laptop maker.
Reinstall if needed. Right-click the adapter > Uninstall device, restart, and let Windows reinstall a compatible driver, or install the maker's package.
Test without a dock. Some DisplayLink and docking drivers don't support Night Light. Connect the display directly to compare.

🚫

Skip "driver updater" utilities. Mismatched drivers they install can cause new display problems.

06. HDR, Color Settings and External Monitors

🎨 When It's On but Looks the Same

Test with HDR off. Go to Settings > System > Display > HDR and turn it off for the screen, then try Night light again.
Check vendor color tools. NVIDIA Control Panel, AMD Software or Intel Graphics Command Center may override color settings. Reset their color adjustments to default.
Remove custom color profiles. In Settings > System > Display > Advanced display, check for a calibrated or custom profile that overrides Windows.
Check the monitor. Reset the monitor's own color or "blue light" mode to default, since it can conflict with Windows.

07. Registry Reset for a Greyed-Out Night Light

🧱 Clear the Cached Night Light Settings

Microsoft documents this fix for a greyed-out Night Light after a driver update didn't help. Back up first: in Registry Editor choose File > Export.

Open Registry Editor. Press Win + R, type regedit, press Enter.
Go to this key. Paste the path below into the address bar.

HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\CloudStore\Store\Cache\DefaultAccount

Export, then delete both subkeys. Right-click each, choose Export, save it, then Delete.

$$windows.data.bluelightreduction.bluelightreductionstate

$$windows.data.bluelightreduction.settings

Restart Windows and check whether Night light is available again.

Names may vary slightly between Windows builds (some show a "default$" prefix). Delete only keys containing bluelightreduction.

⚠️

The registry holds settings Windows needs. If you're not comfortable, ask for help instead of deleting other keys.

08. Night Light Stuck On or Won't Turn Off

🔒 When the State Gets Stuck

Disable the schedule. In Night light settings, turn off the schedule so it can't switch on by itself.
Toggle it manually. Use Turn off now, then check the quick settings tile matches.
Update the display driver (section 5). A corrupt driver is a known cause.
Reset the saved state. A reported cause of Night Light turning on after startup is a stuck saved state; the registry reset in section 7 clears it.

09. Windows Updates and System Repair

🛠️ Fix Underlying Corruption

Install pending updates in Settings > Windows Update, restart, then run these from Terminal (Admin).

DISM /Online /Cleanup-Image /RestoreHealth

sfc /scannow

Also try Settings > System > Troubleshoot > Other troubleshooters if a display troubleshooter is listed.

10. Fix Methods Compared

📊 Risk, Time and Impact

Method	Data Loss Risk	Typical Time	Best For
Toggle, strength, restart	None	1–3 min	No visible change
Location and time fix	None	2–5 min	Schedule greyed out
Update display driver	None	10–20 min	Switch greyed out
HDR / color tool reset	None	5–10 min	On but no effect
Registry reset	Low (export first)	5–10 min	Greyed out or stuck
DISM + SFC	None	15–40 min	After updates
Reset this PC (keep files)	Apps removed	45–90 min	Last resort

11. Effort vs. Risk Meter

🎚️ Editor's Estimate (out of 10)

Settings check: effort

1 / 10

Risk

1 / 10

Driver reinstall: effort

4 / 10

Risk

2 / 10

Registry reset: effort

6 / 10

Risk

4 / 10

Reset this PC: effort

5 / 10

Risk

8 / 10

12. Do's and Don'ts

✅ Fix It Safely

✅ Do

✔️Try the simple settings first
✔️Get drivers from Intel, AMD, NVIDIA or your maker
✔️Export registry keys before deleting
✔️Test without a dock or adapter
✔️Restart after each change

🚫 Don't

✖️Delete registry keys you don't recognize
✖️Use registry cleaners or "fixer" tools
✖️Install drivers from random sites
✖️Run Night Light and a monitor blue-light mode together
✖️Reset Windows as a first step

13. Which Fix For Your Situation

🎯 Your Situation to Your Best First Move

Your Situation	Start With	Then Try
Night light switch greyed out	Update display driver	Registry reset
Only the schedule is greyed out	Location + time zone	Use set hours
On, but screen looks unchanged	Raise strength, HDR off	Reset vendor color tools
Stuck on or won't turn off	Disable schedule	Registry reset, driver update
External monitor ignores it	Direct connection test	Different cable or adapter
Nothing works	DISM + SFC	Ask for help, then Reset (keep files)

14. Prevent It Returning

🛡️ Habits That Keep Night Light Working

🔄

Update drivers from the source

Use your laptop or GPU maker, not third-party updaters.

🕒

Keep time automatic

Automatic time and time zone keep the schedule accurate.

🎨

Avoid overlapping tools

Use one blue-light tool at a time, not several.

📍

Make a restore point

Create one before big driver or registry changes.

15. Final Summary

The Order That Works Best

Check the toggle, strength and schedule, then confirm location and time. Update or reinstall the display driver, test HDR and color tools, and only then export and delete the two Night Light registry subkeys.

If an external display or dock is involved, test with a direct connection. If you're still stuck, send us the details below and we'll look at it with you.

16. Frequently Asked Questions

Most often a missing, outdated or generic display driver, or a corrupted Night Light settings cache. Update the driver first, then try the registry reset.

Location services may be off or the date, time or time zone may be wrong. Fix those, or choose "Set hours" and enter your own times.

The strength may be too low, HDR may be on, or a graphics or monitor color setting is overriding it. Raise strength, turn HDR off, and reset vendor color tools.

Export, then delete the two subkeys containing bluelightreduction under CloudStore\Store\Cache\DefaultAccount in HKEY_CURRENT_USER, then restart Windows.

Some docks, adapters and DisplayLink drivers don't support it. Connect the monitor directly and update the graphics driver.

No. It only clears saved Night Light preferences. You can import your exported keys to undo it.