Win10 official version upgrade solution screen brightness can not be adjusted

Recently, Microsoft's official version of the win10 system has emerged in an endless stream, but many users still can't resist the desire to upgrade win10. Different from win7 64-bit pure version, it will inevitably encounter such problems in the process of upgrading and experience. Recently, some users have upgraded the official version of win10 in the notebook and the screen can not be adjusted. In the previous tutorial, the screen brightness adjustment method of the notebook win10 system was also introduced. What should I do if the screen brightness cannot be adjusted?
Upgrade win10 After the official version, the screen brightness cannot be adjusted. Steps:
1. Use the shortcut key in win10<;Win+R” Open the running window and enter “ldedit”; press OK to bring up the registry editor;

2, search in the registry <;featuretestcontrol” option;

3, after the featuretestcontrol option is found, modify its numerical data to ffff, and finally click OK, restart the computer to take effect.
In the win10 system, the screen can not be adjusted mainly because the registry is modified. We can modify the registry value data according to the tutorial method. Then the problem of not adjusting the screen brightness is easy to solve. It is best to back up the registry beforehand to avoid unnecessary trouble.