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

first, try to use the Internet to find a common solution to the Win8.1 screen brightness can not adjust the solution:

One of the more ways you can use the web is to fix the problem of Win8.1 screen brightness by modifying the registry.

The specific methods are:

1, use WIN+R combination shortcut key to open the Run dialog box, and then use: regedit command to open the registry.

2, after opening the Registry Editor, expand the location in turn:

HKEY_LOCAL_MACHINESYSTEMCONTROLSET001CONTROLCLASS{4D36E968-E325-11CE-BFC1-08002BE10318}

Then change the value of the kmd_enablebrightnessinterface2 in 0000 and 0001 to 0.

3, after the completion, restart the computer can.

Note: If not 0001, only 0000 can be, and the other two items inside if the Kmd_enablebrightnessinterface2 registry key can not be found, new, new type is REG_DWORD.

Some netizens through the above methods, successfully resolved the Win8.1 screen brightness can not adjust the problem, but the author through the above method still does not solve the problem.

　　Second, try to update the computer driver

Then the author uses the Driver wizard, Master Lu and other software to detect the existence of the computer driver problem, through the detection of the CPU and the motherboard driver has available updates, but ultimately in accordance with the upgrade after the problem, still unresolved.

Third, try to make a Windows Update

A few updates were detected in the Win8.1 Windows Update, but the problem persists after the update is driven.

　Four, try to uninstall the independent graphics driver

Because the Win8.1 screen brightness is not adjustable, it is usually related to devices such as system setup or video card. So try to uninstall the independent graphics driver, because the notebook is i7, in the graphics device can be found in the CPU with the video card and independent graphics, so I first uninstall the independent graphics driver, and restart the computer, the final still is the screen brightness can not Regulation.

At this point I have a little doubt that the notebook screen is not a problem, but the end of the author still want to try again.

The next action is to use the Driver wizard, again will be independent graphics driver installed, and then this time I uninstall is the Core i7 processor with the HD4000 kernel video card, the surprise is, when unloading the HD4000 core graphics card, the notebook screen unexpectedly magical, and also can normal adjust the screen brightness.

Through this computer malfunction, can make people understand, the author notebook computer screen brightness problem, mainly due to the CPU with the core graphics driver problem, although the previous use of the Driver Wizard and other software and did not detect the problem, but finally through the uninstall can restore the screen brightness, and finally installed on the driver will not appear problems. If you encounter Win8.1 screen brightness can not be adjusted, then may wish to try the author of the above ideas and solutions.