2012 iMac Upgraded to Ventura with OpenCore - Thunderbolt Display not working

[sourcehound]

Ran the opencore patch procedure to upgrade my late 2012 iMac 16/256 to Ventura. Runs reasonably well, but the Thunderbolt display is not working at all. It shows up in the system report and the USB and Sound connections are working properly, just no video. One thing that seemed odd too is that the built in iMac display appeared as a generic display in "displays" and I couldn't change the resolution at all so I suspect some graphics driver issue. Anyone here dealt with this?

 

[esbardu]

Ran the opencore patch procedure to upgrade my late 2012 iMac 16/256 to Ventura. Runs reasonably well, but the Thunderbolt display is not working at all. It shows up in the system report and the USB and Sound connections are working properly, just no video. One thing that seemed odd too is that the built in iMac display appeared as a generic display in "displays" and I couldn't change the resolution at all so I suspect some graphics driver issue. Anyone here dealt with this?

It seems that you need to apply post-installation patches to enable graphic drivers.