@CaseySJ and others:
I need some help.
I flashed my AR AIC with EliasFr v1 Alpine Rdge ROM. The Apple Thunderbolt Display is connected via an Apple TB3 to TB2 dongle. The display, including the camera and mic, worked, but, when I tried to wake from sleep, the fans spun up but the display didn't light up. I used screen sharing, and, for about 30 sec after I woke the system the mouse was responsive, but after about a minute the screen sharing froze. I repeated this setup several times, to make sure it was a repeatable problem.
I went back to the ROM repository and decided to try NorthAmTransAm's flashed AR NVM21. I have a secondary monitor attached via DVI from my RX590, and a DP out from the 590 connected to DPin 1 on the AR. TB display is connected to TB1.
At the end of the boot, the secondary screen shows the desktop but the TB monitor remains black. Strangely, though, system report shows a fully populated TB bus, including showing the attached TB monitor. IOReg shows a fully populated tree on RP21, showing the monitor, FaceTime camera, and display audio on DSB1. So everything I know to check looks in order except for a black screen on the TB.
I am using the BIOS settings as you directed on page 1. (I have tried internal GFX enabled and disabled.) I am on BIOS 12d, which is the latest.
Attached is a screen shot of System Report--Thunderbolt and Graphics/Displays, IOReg, and my Clover folder. I've also attached the original AR ROM I extracted before I loaded the first modded ROM, in case it is slightly different than the one that Elias or NATA started with.
Thanks in advance.
Edit--the kexts in .../Clover/kexts/other/ folder are older than what are loaded from /L/E/ folder. But I just got religion and moved the kexts from /L/E/ to Clover and updated Lilu, WEG, and AppleALC. Still the same TB situation.
Edit 2--the camera, microphone, ethernet, and the speaker in the TB monitor all work. just not the video.