Right After Startup, Monitor Dims Consistently - Microsoft
https://answers.microsoft.com/en-us/windows/forum/all/right-after-startup-monitor-dims-consistently/488b76dc-cb8d-41d5-8ef0-fe8cafde4b16
Oct 26, 2018 . When laptop (plugged in or on battery, tested both, and it performs the same way) gets to the login screen, that screen initially launches bright for about 1, maybe 2 seconds, at most, then it dims the screen all the way down to 50% brightness at most and more likely 25% brightness. This is AFTER I performed the adaptive brightness fix.
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