Hello,
My Mac Pro 3.1 is now running patched macOS Catalina with new Metal compatible MSI Frozr Nvidia 680.
Yesterday, I finally could plug my DisplayPort monitor to the Mac, because the Nvidia 680 has got DP connector.
So, then I started the Mac (booting the patched macOS Catalina). But nothing was showing on the DisplayPort Screen. The second screen, which is connected using HDMI was working fine. The DP screen was not even detected.
So then I tried booting in the officially supported, OSX El Capitan. And it all worked flawlessly.
Does anyone know, why my 2008 Mac Pro with MSI Frozr Nvidia 680 can't display ANYTHING on monitor plugged in to the DisplayPort connector on the GPU, when running macOS Catalina?
Any help is appreciated.