What to do if Windows 10 is not adjustable screen brightness
Like Windows 7 and 8.1, Windows 10 will include a complete set of drivers for all main components of iron. However, some users have reported that after installing the new version of the system they have to have problems with the screen, more brightness. Indeed, the reason for this may be lack in the system need driver, that is most often found on laptops, if a driver you are all right, most likely, non-working brightness control is connected with incorrect settings in the registry.
Here is how to check and fix. By the regedit or by any other method open registry editor and expand the following branch:
In the last directory must be the DWORD value KMD_EnableBrightnessInterface2. Most likely, its value will be equal to the unit, you change it to 0. As parameters KMD_EnableBrightnessInterface2 may be a few using the built-in search (F3), find the other keys and also change the value from 1 to 0, then restart the computer. If problems with the brightness adjustment was associated with the wrong setting in the key after a reboot everything will work fine.