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You need to download the FakePCIID_HD4600_HD4400.kext.zip and the EFI / CLOVER / kext/ 10 11 or S / L / E folder to install it, and then complete the configuration, as shown in the figure, your HD4400 graphics card problem has been completed. FakePCIID_HD4600_HD4400.kext.zip

The Synaptics touchpad can identify four finger operation in macOS10.12.4 use, but cannot customize gestures, but also can customize keyboard function keys in the FN, especially the display brightness adjustment cannot be more precise to adjust. I am in the process of using only three fingers instead of the right mouse button to complete the operation, which is extremely inconvenient. I hope the author can improve these problems, can pay more attention to the use of Synaptics touchpad experience.