I've tried this method to get the LG Ultrafine 5K to run in 4K (see attachment), but unfortunately the monitor stays black:
View attachment 493614
I was able to turn it on one time, but it could only display in the Gigabyte Boot screen, in BIOS and in OpenCore Boot Menu, and only after I have done the following in BIOS:
Settings > IO Ports > Initial Display Ports = "IGFX" (was earlier "PCIe 1 Slot", where I have my Radeon VII)
+
Settings > IO Ports > Internal Graphics = Enabled (was earlier "Disabled")
When I go into the boot menu and select my OSX boot drive to start OSX, the apple loading screen starts and halfway thru the monitor shuts off again.
Strangely though is that the OSX system recognizes the speakers which are fully functional and the 1080p web camera as well as the microphone next to it. So I can use these, but the panel is completely off.
Any idea what I am doing wrong? Gigabyte only write how I should plug the cables, which I have done and which apparently have been done correctly (otherwise I would never be able to see anything on the monitor?). But they don't write anywhere if I need to change anything in BIOS or do anything else to get it to work.
I have written to Gigabyte's support about this, but as people may know it takes about a week to get a reply, which doesn't make it very helpful.
I have ordered a GC-Titan Ridge AIC to get full 5K, but unfortunately I will have that card in 2 weeks from now, so finding a solution with the on-board Thunderbolt ports waiting for it would be very pleasant.