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I got the same problem, I think i got a begin of solution, the effect is a lot less visible, I continue to see like an higher brightness when I go from black screen to white but I dunno if it's an eyes effect or a real change of brightness
I follow that :
So to complete and paraphrase:
go to :
(for me it was in 0001)
find the value FeatureTestControl
Open the calculator in programmor mode, go in HEX and write the value written, look at the binary, it give you for exemple:
HEX : c200
BIN : 110000100000000
change the 5th bit from the end to 1:
Put in on calculator in programming mode/BIN and get the HEX value
BIN : 1100001000010000
HEX : c210
modify the register with regedit and put the new HEX value in FeatureTestControl
Restart your computer
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Thank you for joining the community. I will like to verify with you if the windows brightness has the same setting when the laptop is on battery and plugged in?
You case review that on control panel >all controls panel items >power options > edit plan settings
I cant even seem to find the option to disable it.
As for changing the registry, I tried the solution and changed the value of FeatureTestContect from 8200 to 8210 but in vain. I am facing this problem with my external display rather than built in one on my laptop.
I cant watch a single movie or anything because the brightness decreases to a near 0 with a drak background. A solution would be appreciated.