A small coup that can't adjust the brightness of Win8 screen

Recently, the Lenovo Z500 notebook is equipped with Win8 Professional Edition system. Today, after adjusting the screen brightness with Fn+F11 key combination, the screen suddenly becomes the darkest state, and the screen does not go back. . This made me anxious, and the screen was so dark. I tried various methods, and finally I finally solved it, and listened to me slowly.

First, by modifying the registry to solve the problem that Win8 screen brightness can not be adjusted.

The specific method is:

1. Open the run dialog with the Win+R combination shortcut and open the registry with the :regedit command.
Open Win8 Registry Method

2. After opening the Registry Editor, expand the location:

HKEY_LOCAL_MACHINE\\SYSTEM\\ControlSet001\\Control\\Class\\{4d36e968-e325-11ce- Bfc1-08002be10318}

Then change the value of KMD_EnableBrightnessInterface2 in 0000 and 0001 to 0.

3, after the completion, restart the computer.

Note: If there is no 0001, only change 0000, and if you can't find the KMD_EnableBrightnessInterface2 registry key in these two items, you can create a new one, and the new type is REG_DWORD.

Some netizens successfully solved the problem that Win8 screen brightness could not be adjusted through the above methods, but the author still did not solve the problem through the above methods.

Second, try to update the computer driver

After using the driver wizard, Lu master and other software to detect whether the computer has a driver problem, through the detection found that the CPU and motherboard driver available updates, but ultimately in accordance with After upgrading the updated issue, it still remains unresolved.

Third, try Windows update

Enter Win8 Windows update, detected several updates, but after updating the driver, the problem remains.

Fourth, try to uninstall the discrete graphics driver

Because the brightness of Win8 screen can not be adjusted usually related to system settings or graphics card and other devices, so try to uninstall the driver of the discrete graphics card, because the notebook is i7 Uniquely, in the graphics card device can be found in the CPU comes with a graphics card and a discrete graphics card, so I first uninstalled the discrete graphics driver, and restarted the computer, and ultimately the screen brightness can not be adjusted.

At this point, I have been a bit skeptical about whether there is a problem with the notebook screen, but in the end I still want to try again.
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