- Nov 11, 2018
- Gigabyte Z490 Vision D
- RX 580
- Classic Mac
- Mobile Phone
Welcome to the forum! Was the Thunderbolt firmware flashed when you were running Catalina, or did you flash the firmware after upgrading to Big Sur? Because the eGPUs were working in Catalina, I assume firmware was flashed back then?
- What are the makes/models of the two eGPUs?
- Which one works in Big Sur and which one does not?
- What are the makes/models of the GPUs inside each eGPU chassis?
Please clarify if you flashed the firmware after upgrading to Big Sur or it was flashed earlier when you were running Catalina?Anyway. I thought I'll take the plunge and so I've successfully flashed the Firmware but now Big Sur will not boot.
This just means that the Thunderbolt SSDT you're using is not properly set up. Please post the following files:I get the following error:
IOThunderboltEEPROM::getDROM - Error getting DROM from I/O Registry (0xe00002be)
- IORegistryExplorer --> File --> Save As...
- The Thunderbolt SSDT you're currently using
This is typically resolved by fixing the Thunderbolt SSDT (see above).I've booted into my working Catalina Backup and I can see that the Thunderbolt Device Tree shows the Thunderbolt Bus but the speed is 20GB/s
Please clarify whether (a) both graphics cards in both eGPUs do not show up or (b) one of the graphics cards in one of the eGPUs shows up?Hotplug must be working because both ports recognise the eGPU enclosures when plugged in but the graphics cards within do not show up in Graphics/Displays.
- Is this in Catalina?
- Your first sentence states that both eGPUs were working in Catalina...