Windows 10: Night light has stopped working after Win 10 1909 update

The option is there not grayed out, but nothing happens after switching it on the schedule is off, so it supposed to dim the screen regardless of schedule.


What I did among things suggested online:

• Updated graphics card drivers.
• Updated display pnp monitor drivers.
• Disabled fast startup.
• Tinkered with registry in all possible ways.
• Signed out and signed in.
• Signed in as different user.

Nothing has solved it for me.


I'm on Windows 10 1909 18363.900 x64, Ryzen 5 3550H, Radeon Vega 8.


I aslo checked if any other programs are running in background that might control the brightness. There're -- it's a pre-installed Huawei app from the manufacturer -- switched it off, though previously it was running and didn't cause any problems with night light. No success. Currently I'm using it to dim the screen, it has a feature similar to night light, though manual. It's the only one working as both night light and f.lux refuse to work.


I guess the only option left is to roll back Windows updates.

:)

 

No Night Light

Hi allisonb1

Try these steps

Option 1. Reset Night Light-related Settings on Windows 10 Fall Creators Update

If you find the night light in the Action Center or the Settings is greyed out after the Windows 10 Fall Creators Update, you can fix it with the steps below:

Step 1. Use Windows shortcut keys Win + i to open Settings.

Step 2. Go to the Privacy menu.

Step 3. On the left side, choose the Location tab.

Step 4. Click the Change button under the Location for this device.

Step 5. Toggle the switch under the Location for this device to ON.

Step 6. Toggle the switch under the Location service to ON.

Step 7. Restart the computer.

Now check the Action Center or the Settings on your Windows 10 Fall Creators Update to see if the night light feature is available.

Option 2 . Modify Registry to Fix Night Light Not Working on Windows 10 Fall Creators Update

If the methods above didn't work, you may need to modify the registry to fix the greyed-out night light button or the night light not working issue. Note: Windows Registry is a vital database on Windows OS computer. Any misoperation will cause server system
problems, such as 100% disk usage issue, blue screen issue, endless reboot, etc. So it's important to backup registry before the changes.

Now let's kill the night light not working and release the pain:

Step 1. Use Windows shortcut keys Win + R to launch Run.

Step 2. Type into regedit.

Step 3. Hit the Enter key.

Step 4. Copy and paste the path into the address bar of the Registry Editor: HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\CloudStore\Store\Cache\DefaultAccount

Step 5. Press the Enter key.

Step 6. Right-click the key $$windows.data.bluelightreduction.bluelightreductionstate under the DefaultAccount and select the Delete to remove it.

Step 7. Right-click the key $$windows.data.bluelightreduction.settings and select the Delete.

Step 8. Restart the computer.

Then you can go to the Action Center or the Windows Settings. The night light not working issue has been resolved now and the night light button is available.

Source:

https://www.tenforums.com/tutorials/73518-turn-...

https://www.drivethelife.com/windows-10/night-l...

 

Night light not working

Hi,

Night Light is still listed as a known issue on the update History page.

Windows 10, version 1903 and Windows Server, version 1903 - Windows Release Information

Gamma ramps, color profiles, and night light settings do not apply in some cases

Microsoft has identified some scenarios where gamma ramps, color profiles and night light settings may stop working.

The only thing you can do is to wait to get this fixed.

 

Night light after Win 10 update (8/29/19)

Hi LawFlow

I am an independent advisor here to help

there's actually a known issue with Windows 10 version 1903 involving the night-light functionality as follows

"Microsoft has identified some scenarios where gamma ramps, color profiles and night light settings may stop working.

Workaround: If you find that your night light has stopped working, try turning the night light off and on, or restarting your computer. For other color setting issues, restart your computer to correct the issue.

Next steps: We are working on a resolution and will provide an update in an upcoming release."

Source

https://docs.microsoft.com/en-us/windows/releas...