Why can't Win8.1 adjust the screen brightness?

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.

2, after opening the registry editor, expand the location:

HKEY_LOCAL_MACHINESYSTEMControlSet001ControlClass{4d36e968-e325-11ce-bfc1-08002be10318}

Then 0000 and 0001 The value of KMD_EnableBrightnessInterface2 can be changed 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.

The next operation is to use the driver wizard, and then install the discrete graphics driver again, then this time I uninstalled the HD4000 core graphics card that comes with the Core i7 processor. Surprise is that when uninstalling HD4000 The core graphics card, the notebook's screen turned out to be magically bright, and can also adjust the screen brightness normally.

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. But in the end, you can restore the screen brightness after uninstalling, and finally install the driver 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.