[German]Microsoft claims to have fixed a nasty bug that caused external displays to suddenly turn black when apps displayed certain content. The update in question was already released in October 2020.
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Screen flickers after update
In the blog post Windows 10 V2004: Issues with Update KB4579311 I reported in October 2020 about various issues. One was a flickering screen:
A user complains in this reddit.com post that a second monitor is no longer activated. In this reddit.com post in the same thread a user complains that afterwards the screen flickers for 5 minutes before an ad comes up. Techdows mentions here that users end up with a black screen.
Blog-reader Harald also reports in this comment about issues with the graphic adapter. In a comment here of October 21, 2020, I even pointed out that Microsoft has solved the issue with an update for Windows 10 1909. But there was no solution for Windows 10 2004.
Support post from Microsoft
In the support article External display goes black when you try to draw using an app on Windows 10 version 2004 dated October 28, 2020, Microsoft describes the bug, but it should only apply to Windows 10 Education Version 2004 (which I find strange). Microsoft writes about the bug:
If you have a Windows 10 version 2004 device with a built-in monitor (such as a laptop or tablet) and an external monitor connected to it that is set to duplicate the primary monitor, both monitors may flicker and the external monitor may go black when you try to draw with an Office application (such as Word). This can also happen with some other applications that are capable of drawing, such as Whiteboard. If you check the box in Device Manager, a warning icon (a yellow triangle with an exclamation mark) will appear next to your graphics controller.
In the support article Microsoft writes that restarting Windows 10 2004 should at least temporarily solve the problem. To fix the problem, you should download and install the update KB4577063. This is a preview update from October 1, 2020, but I didn't find anything about screen flickering in the list of fixes. (via)
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