Windows 11

Well, it turns out that the background screen dimming issue has to do with playing an embedded video in Chrome using DX 11 rendering. Turning off hardware acceleration effectively stops the issue, but if you want to keep acceleration turned on for other reasons you can have Chrome use dxd9 (or OpenGL) rendering instead.

This is set on the chrome://flags/ tab.

Search for ANGLE, and it will give you a list of rendering options to select from.

Evidently this happens in Edge and other video players based on DX 11 as well, so I would expect MS will get this patched up at some point in the future.
 
After my PC crash last summer, my son rebuilt my rebuild :biggrin-new: and put on Win 11. Still working it out but so far so good,
 
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