Win8 screen can not adjust the brightness?
First, by modifying the registry to solve the problem that Win8 screen brightness can not be adjusted.
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 Win8 Registry Method
2. After opening the Registry Editor, expand the location:
HKEY_LOCAL_MACHINESYSTEMControlSet001ControlClass{4d36e968-e325-11ce-bfc1-08002be10318}
Then KMD_EnableBrightnessInterface2 in 0000 and 0001 Change the value to 0.
3, after the completion, restart the computer.
Note: If there is no 0001, only change 0000. In addition, 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 netizens successfully solved the problem that Win8 screen brightness 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.
Third, try Windows update
Enter Win8 Windows update, detected several updates, but after updating the driver, the problem remains.
Fourth, try to uninstall the independent graphics driver
Because the brightness of Win8 screen can not be adjusted 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 The device can be found in the CPU 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 then this time I uninstalled the HD4000 core graphics card that comes with the Core i7 processor, surprise. The result 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 Master's driver butler again to install the HD4000 core graphics driver installed on the i7 processor again. There is no problem, and the screen brightness is still normal.
HD4000 core graphics driver installation
This time it can be said that it is a big expense, toss for a few hours, but finally got it. The conclusion is that the brightness of this laptop screen is mainly caused by the core graphics driver problem that comes with the CPU. After uninstalling, you can restore the screen brightness, and finally install the driver without problems. You can try this idea if you encounter such problems in the future.