Enable Screen Brightness Control with Registry Tweak
You can enable screen brightness control in Windows by using the KMD_EnableBrightnessInterface2 registry parameter under the reg key HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\Control\Class\{4d36e968-e325-11ce-bfc1-08002be10318}\0000.
Open the Registry Editor (regedit.exe), go to the registry key above, find the DWORD parameter KMD_EnableBrightnessInterface2 and change its value from 1 to 0
There can be several KMD_EnableBrightnessInterface2 parameters in the registry. So use the search (F3) and find all the other parameters named KMD_EnableBrightnessInterface. For all found parameters, you need to change the value from 1 to 0.
Reboot your laptop.