What should I do if the screen brightness adjustment fails after the win10 graphics card driver is modified?

The official version of Windows10 was released, but some computer graphics drivers are not compatible. The screen brightness is either too dark or even black, or the brightness is too bright, bright and blinking, the screen brightness cannot be adjusted, and the adjustment is invalid. In the Win10 preview version, the company's multiple SONY laptops have this problem, so roll back to the original system. Now that the official version of Windows10 came out, I thought that the driver compatibility problem was solved. I didn't expect to adjust the screen brightness after the installation. What should I do?

Before updating Windows, changing drivers, modifying the registry, etc. I have tried invalid. Maybe these operations are not suitable for the author's computer. I want to find some big god solutions, that is, modify the graphics driver to solve Windows10. The problem that the brightness of the screen cannot be adjusted. The following figure shows the comparison of the graphics before and after the modification of the graphics card, but the brightness still can not support the keyboard to adjust, can only be adjusted in the display settings, but this is not important.

1, Windows10 method to adjust the screen brightness, as shown in the figure, the right side of the desktop blank - [display settings] - [display] - [brightness level].

2, ready to work, view your graphics card hardware ID, click [Advanced Display Settings] - [Display Adapter Properties] in the previous step, enter [Properties] in the following figure.

3. In the [Details] tab of the graphics card driver properties, select the hardware ID from the property drop-down menu. The following values ​​are similar to the hardware ID prefix of the graphics card. Just remember 0046, this is I have this computer's graphics card, this is a Core i3 64-bit CPU, the model is M330 is a very old computer, the driver update official no matter.

4. In the above driver properties, check the version number of your driver, because your computer driver function is good, but there is a problem with the screen brightness, so download this version of the driver to modify. Remember to copy a copy and keep it for backup before making changes.

5, open the driver file directory, find the driver installation information, inf file in XXX.inf format, pay attention to distinguish between 32-bit (X86) or 64-bit.

6, open this installation information file, Ctrl+F find: PCI\\VEN_8086 at the beginning, to see if this driver supports your graphics card hardware ID, if you can not find the driver wizard can also be used The tool software will backup the driver of Windows10 update and then modify it. If the downloaded driver is not supported, it can be modified. Some new drivers that the old graphics card wants to use are also modified here, so that the new driver can also be installed. More detailed Please find my other experience.

7. After the above is ready, we can start to modify the installation information of the graphics card driver.

Ctrl+FSearch: FeatureTestControl, we see the value after REG_DWORD, in fact, this is also the REG_DWORD value of the FeatureTestControl item in the registry, so if you have installed the graphics card driver, you can modify the registration if you don't want to install it again. The REG_DWORD value of the FeatureTestControl item in the table, but because the registry modification is dangerous, it is not good to have a strange problem, so modify the installation information.

If the original value oxF800 is changed to ox01c4, my computer is Sonny VPCS11AVJ. This computer is only released in Japan, and the Great God tested the ThinkPad T61 to change 0x84 to 0x01c4. In the ThinkPad X301, 0x200 is changed to 0x300, so the CPU is different according to the computer model. It can only expect more tests to find out the rules, but it gives us a correct solution.

8, modify the completion of the inf file, and then install the modified graphics card driver, this is not signed by the Microsoft driver, so also to disable the Windows driver mandatory signature Then you can install this modified driver.