MacPro 5,1 with GTX 980Ti and 10.12.1

[derwolf]

I have a MacPro 4,1 flashed to 5,1 with a GTX 980Ti. It was working fine in Mavericks, but when I updated to Sierra I can't get the web driver to work. I just did the update so I have build 16B2657. I can get the latest 367.15.10.15f01 driver to install by editing my SystemVersion.plist to 16B2555. I revert back to 16B2657 after install and reboot. At first I get a message: "The default OS X Graphics Driver is now being used because the NVIDIA Web Driver 267.15.10.15f01 is not compatible with your current OS."

 

I edited the Info.plist file in the NVDAStartupWeb.kext to activate the driver for my build which stops the message about the compatible version. However, when I attempt to change to the web driver using the Nvidia Utility and reboot it reverts back to the stock driver. 

 

When I run diagnostics on the kext file I get a code signing failure:

 

MacPro:Extensions $ sudo kextutil -t NVDAStartupWeb.kext
Diagnostics for /System/Library/Extensions/NVDAStartupWeb.kext:
Code Signing Failure: code signature is invalid
kext-dev-mode allowing invalid signature -67030 0xFFFFFFFFFFFEFA2A for kext "/System/Library/Extensions/NVDAStartupWeb.kext"
kext signature failure override allowing invalid signature -67030 0xFFFFFFFFFFFEFA2A for kext "/System/Library/Extensions/NVDAStartupWeb.kext"
Invalid signature -67030 for kext <OSKext 0x7fad1965cec0 [0x7fffb2505c30]> { URL = "file:///System/Library/Extensions/NVDAStartupWeb.kext/", ID = "com.nvidia.NVDAStartupWeb" }

 

I had kext-dev-mode=1 enabled previously, but maybe it's not working in 10.12.1. 

 

I'm hoping somebody here can point me in the right direction of what to try next.