Win8 computer screen brightness can not be adjusted how to do

1. Press win+r at the same time to open the computer's running window, then enter regedit in the window and click enter, so you can open the computer's registry editor .

2. The menu on the left side of the Registry Editor window is very rich, we need to expand HKEY_LOCAL_MACHINESYSTEMControlSet001ControlClass{4d36e968-e325-11ce-bfc1-08002be10318}.

3. Next we find the KMD_EnableBrightnessInterface2 file in 0000 and 0001 in the right window and double-click, then change the value data to 0.

4. Finally, let's restart the computer, so that all the operations are completed.

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