After upgrading the Windows 10 May 2020 (20H1/Version 2004) feature update, there was a problem with user feedback when using F.lux. F.lux is an application that adjusts the color temperature of a monitor, and users say the upgrade will result in blue/green, a mess yelling lines on the second screen.
Windows 10 May 2020 feature update introduces WDDM 2.7 support and improves support for multi-monitors. However, user feedback has been a headache after the upgrade, with artifacts in display rendering or slashes in GIFs, images, and videos.
These issues began after the user installed Windows 10 Version 2004, and appears to be a compatibility issue between the feature update and the F.lux program.
One user feedback that:
Upgrading to the latest Windows 10 Version 2004 feature update, my second monitor will appear strange artifacts when playing video.
Another user responded:
I also have this problem. However, artifacts only appear on my first monitor, not on my second monitor. One of the temporary fixes I found was to install or reinstall the latest nvidia drivers.
However, this approach is not always useful, and another user has responded:
This eliminates artifacts, but for some reason, when I restart my computer, the artifacts come back.
The F.lux team was then contacted by themedia, who said they had noticed user feedback and had launched an investigation. In the reply, it read:
We’ve been tracking the problem. This is not often the case with monitors connected with an HMDI cable. These are color artifacts, not ‘messy lines’. Any time there are many changes to the video driver, something like this will occur, and they will usually be fixed soon.
The app’s authors also confirmed that F.lux works on a single-monitor system. If you see a grid or artifact after upgrading to Windows 10 Version 2004, you can try updating the GPU driver, temporarily disabling F.lux, or roll back to a previous version of Windows.