I would like to verify more information. Can you please post your dxdiag report?
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I found a faster solution in here -> GUIDE: Display control via Windows! Brightness, contrast, etc. (DDC/CI)
Note there is also a software for samsung monitors - MagicTune - but it doesn't work. I knew that before.
Still cannot make it permanent, have to run it every time. Too bad the intel graphics control panel cannot make it permanent, like MagicTune would.