- Jun 13, 2019
- ASUS ProArt Z690-CREATOR WIFI
- RX 6900 XT
In almost all cases, the TB monitor almost never shows anything, or even lights up. I don't know if what I did works on the old BIOS, but the most consistent way for me to cause it to happen was to enter BIOS setup with a standard monitor (I'm using an LG 27UK650 over HDMI) then plugging the Thunderbolt cable into the LG UltraFine 5K (already plugged into AC power), waiting for video loss, then holding down the case power button and quickly pressing it to power back on.Thank you for the detailed writeup. The main takeaways are:
I wonder if we need to import an Apple video DXE/PEI driver as well...
- New BIOS does not help (yet) with Thunderbolt monitors (particularly when using iGPU to drive Thunderbolt display)
- There is no video signal during POST and OpenCore Picker
- It is necessary to connect a regular monitor and then connect the TB monitor after macOS has loaded, then unplug the regular monitor
- One difference noticed with new BIOS:
- In BIOS Setup, when both regular and TB monitors are connected, then TB monitor will display BIOS or POST screen for a second, then both monitors lose video signal
The video import sounds interesting, as I suspect the BIOS fails to initialize the monitor on it's own without dGPU. I've also been curious how it handles in an RX 6800 XT USB-C port, but I haven't been able to get one.