Win8.1 screen brightness can not be adjusted how to do Win8.1 can not adjust the brightness of the solution

Not long ago, the company just gave a Lenovo Z500 notebook, installed the latest Win8.1 Professional system. However, I was scared today. After adjusting the screen brightness with the Fn+F11 key combination, the screen suddenly became the darkest state, and there was no way to adjust it. So I tried various setting methods found on the Internet and did not solve it. Finally, I suspect that it will not be a broken notebook? Fortunately, the hard work pays off, and ultimately the solution that I think is solved.

Win8.1 screen brightness can not be adjusted how to do Win8.1 can not adjust the brightness of the solution

First, I tried to use the Internet to find a common solution to Win8. 1 screen brightness can not be adjusted solution:

One of the more online methods used by everyone is to solve the problem that Win8.1 screen brightness can not be adjusted by modifying the registry.

The specific method is:

1, use the Win+R combination shortcut to open the run dialog, and then use the :regedit command to open the registry.

Open the Win8.1 registry method

2, open the registry editor, and then 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 create a new type of REG_DWORD.

Some users have successfully solved the problem that the brightness of Win8.1 screen cannot be adjusted through the above methods, but the author still has not solved the problem through the above methods.

Second, try to update the computer driver

After the author used 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 according to After upgrading the updated issue, it still remains unresolved.

Three, tried Windows update

Enter Win8.1 Windows update, detected several updates, but after updating the driver, the problem remains.

Fourth, try to uninstall the discrete graphics driver

Because the Win8.1 screen brightness can not be adjusted usually related to the system settings or graphics card and other devices, so try to uninstall the independent The driver of the graphics card, because the notebook is i7 alone, 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.

Re-install the notebook with a separate display driver

The next operation is to use the driver wizard, and then install the discrete graphics driver again, then this time I uninstalled the Core i7 processor. With the HD4000 core graphics card, the surprise is that when the HD4000 core graphics card is uninstalled, the screen of the notebook is magically bright, and the screen brightness can be adjusted normally.

Uninstall HD4000 core graphics driver

The author finally uses Lu’s driver butler again, and once again installed the HD4000 core graphics driver installed on the i7 processor, there is no problem, screen brightness Also normal adjustment.

HD4000 core graphics driver installation

Through this computer failure, you can understand that the brightness of the notebook screen of the author is mainly caused by the core graphics driver problem that comes with the CPU. Although the software such as the driver wizard has not detected the problem before, but the screen brightness can be restored after uninstalling, and finally the driver is installed without problems. If you encounter Win8.1 screen brightness can not be adjusted, then you may wish to try the author's ideas and solutions.