Win8.1 screen brightness can not be adjusted how to do

First, I tried to use a solution that I found on the Internet that generally solves the problem that Win8.1 screen brightness cannot be adjusted:

One way to use more online is to pass Modify the registry to solve the problem that the brightness of Win8.1 screen cannot 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 Win8.1 Registry Method

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

HKEY_LOCAL_MACHINESYSTEMControlSet001ControlClass{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 the brightness of Win8.1 screen 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 Win8.1 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 Win8.1 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 of 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-installing the notebook with a separate driver

The next operation is to use the driver wizard to install the discrete graphics driver again, and this time I uninstall the HD4000 core that comes with the Core i7 processor. 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

Finally, I used Lu’s driver butler again to install the HD4000 core graphics driver that comes with the i7 processor. There is no problem, and the screen brightness is still normal. .
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, even though the driver is used before. The software such as the sprite did not detect the problem, but in the end, the screen brightness can be restored by 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.