What if the Win7 computer's screen brightness is not lit?

In the latest win7 system download can not adjust the brightness of the computer screen, it seems that a lot of friends have encountered such a problem? In general, desktop computer friends can be directly on the screen through the key to adjust, and notebook users can use the keyboard shortcut keys to adjust. Xiao Bian today in the forum to see a friend's question, said is the upgrade to the latest win7 system download, found that the brightness of the computer screen suddenly reduced a lot, so using the keyboard shortcut keys Fn+f6 to adjust the brightness of the screen, but did not think that no matter how the press can not operate, but the use of these two keys, found that their use is normal, so the problem arises, how do we solve it?

1. First, we press the keyboard Win+r shortcut to open the computer's running window, and then we enter regedit in the Run window and click Enter, so that you can open the computer's Registry Editor window.

2. After that, in the Open Registry Editor window, click to expand HKEY_LOCAL_MACHINE SYSTEM CONTROLSET001 control Class {in the left menu. 4D36E968-E325-11CE-BFC1-08002BE10318} item.

3. Finally, we open 0000 and 0001 respectively, and then find Kmd_enablebrightnessinterface2 in it and double-click Open, then change the key values to 0, and click OK to save the settings.