First, try to use a solution found on the Internet to solve the problem of Win8.1 screen brightness can not be adjusted:
more than one online use The method is to solve the problem that the brightness of Win8.1 screen cannot 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_MACHINESYSTEMControlSet001ControlClass{4d36e968-e325-11ce-bfc1-08002be10318}
then 0000 The value of KMD_EnableBrightnessInterface2 in 0001 and 0001 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 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 in accordance with the problem of upgrading and updating, still not solved.
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 brightness of Win8.1 screen can not be adjusted is usually related to the system settings or graphics card and other devices, so try to uninstall the driver of the discrete graphics card, because the notebook is i7 alone, In the graphics card device, you can find the CPU comes with a graphics card and a discrete graphics card. Therefore, the author first uninstalled the discrete graphics driver and restarted the computer. Eventually, the screen brightness could not be adjusted.
At this point, the author has 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, and then install the discrete graphics driver again, then 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
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, 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.