14 DAY TRIAL // The most recent cumulative update shipped by Microsoft to Windows insiders running Windows 10 May 2019 Update builds reportedly fixes an issue breaking down Night light in the operating system.
Microsoft uses devices enrolled in the Release Preview ring of the Windows Insider program to test the reliability of new cumulative updates for Windows 10 May 2019 Update.
The Fast and Slow rings have already been updated to Windows 10 20H1 (April 2020 Update).
The update shipped by Microsoft this week to Release Preview ring users is KB4501375, and according to WBI, it resolves a Night light bug that has somehow made it to production builds after previously being reported while this feature update was exclusive to Windows insiders.
Update still in testing stage
Night light, which is a blue light filter that makes working on a computer easier on the eyes during the night, failed to activate due to the aforementioned bug. I encountered the same issue on one of my Windows 10 devices, and no workaround allowed me to fix it.
According to the aforementioned source, after installing this cumulative update on a device running Windows 10 May 2019 Update, Night light can be enabled as expected both from the quick action in the Action Center and from the Settings app. Neither worked for me on the device where the bug was encountered.
Keep in mind that this cumulative update is currently available only for insiders in the Release Preview ring, but it should go live for production devices in just a few days. Microsoft hasn’t yet offered an ETA as to when this could happen, however.
New cumulative updates will be released for all Windows 10 versions as part of the next Patch Tuesday rollout that takes place on July 9, and both security and non-security fixes will be included.