White screen with EGPU only connected

I Installed 10.15.4. I can now boot up in my Egpu without doing anything. No white screen or black. The fans rev up for a second and then spin down to normal and then login screen shows up. So in my case it looks like 10.15.4 nights of temp fix it? Let me know

10.15.4 works fine for me. Config: 2018 Mac Mini, RX570 in Breakaway Box, two monitors. FileVault enabled.

Left monitor is connected to two port HDMI switch: one port Mac Mini HDMI port, the other to RX570 HDMI.

Right Monitor connected to DisplayPort on RX570.

Before restart or boot, I switch the left monitor HDMI switch to the Mini.  Once booted I switch it back to R570.  

I have had no problems with this configuration.  While it is booting I may see some strange stuff on the right monitor, but that clears up by the end of the boot process.  The right monitor is my primary monitor (in Display Preferences).

Presumably you could do this just using different inputs on the monitor, but the HDMI switch was more convenient in my setup.

Finally the newly released 10.15.4 beta 2 seems to fix the problem for me. :)

Mac Mini 2018 + RX 570 eGPU

Boot ROM version: 1037.100.340.0.0 (iBridge: 17.16.14236.5.2,0)

I have a Mac mini 2018 + Sonnet egpu with rx570. It seems to reboot successfully most times as long as I have one monitor plugged directly into the Mac mini. I don’t use boot camp so can’t comment on the unfortunately.

it will not boot if both screens are connected to my egpu which is a shame.

but it’s a massive improvement from not booting at all with the egpu switched on for over 12 months.

Issue is fixed with beta 2 for me as well with my MacMini 2018 w/RX5700XT eGPU.

...10.15.3 seems to have fixed the problem, at least with my Vega 56 and the Razer Core X...

Hey Yockster, do you have any idea when 10.15.4 will be released? Do you think that I will be able to skip 10.15.3 and go to .4 directly when it is released?

I am still on 10.15.2 and can work around the issue by waiting about 5 seconds after booting the Mini before I power up the EGPU. When I do this, I can log in normally. If I do a restart, I have to kill the power to the EGPU until I guess that it is past its initial boot sequence. I usually wait to hear my external back-up drive start to power up, then flick the power on on the EGPU.

I am sorry but the .4 beta still does not fix the issue in my case. :((

The latest update changed the bootrom to 1037.100.321.0.0 (iBridge: 17.16.14226.5.3,0)

Now there is no Apple logo during boot with eGPU - only a blank black screen (no more white screen of death though). The display does not go to sleep but the OS does not boot either. The GPU fans now don't rev up which is an improvement. Only if I turn off the eGPU completely beforehand and then turn on the Mac (with the display connected directly to the Mac) can the system boot up. Once I reach the login screen I can turn on the eGPU.

Why Apple????!!!!

My config: Mac Mini 2018 + RX 570 eGPU

I just installed 10.15.4. I get a black screen when trying to boot with the eGPU connected and monitors connected directly to the EGPU (no monitor directly connected to the Mac Mini). Unable to login. Force shutdown, disconnect the eGPU and plug one of monitors into the Mac Mini and it starts fine. Then I can plug the eGPU in.

It's been 6 months and 4 updates since this thread started. I doubt the problem will ever be fixed by Apple.

My Mac Mini 2018, Breakaway Box 550, RX580 with FileVault and 2 monitors connected directly to the RX580 booted with no problem under Mojave at the time Catalina was released. Upgraded to Catalina and the setup no longer booted correctly. A short while later, Apple changed the boot process in Mojave (apparently to what was in Catalina) and systems started having the same issues Catalina users were having. That's my experience and memory, at least.

I was able to upgrade with a 2018 mini and a 5700xt but it wasn't pretty... I disconnected my OWC 550W GPU and connected via HDMI to the mini and the screen went black once the installer started... waited 10 minutes still no screen. Powered off (still with HDMI only) and restarted to see that the install was to take 45 minutes.

Once completed I plugged in the eGPU and switched the HDMI back to the eGPU Displayport and all is working fine.

However, I have not rebooted yet with the eGPU on (little scared at this point it will only work if hot plugged as before).

For me, it isn't fixed completely with the latest public beta. The white screen is gone but sometimes it ends up in an black screen and sometimes it is working now. But I also mentioned that the first time since I have my eGPU, my LG Monitor is recognized as a HDR monitor. But the colors are weird if I set it to the HDR mode. My setup is a Mac mini 2018 with Razer Core X + RX590. Hopefully they will fix it completely in the next beta.

I'm glad you're happy with the setup.

I don't call having to use an HDMI switch (or any of the other methods that have been posted in the discussion) in order to boot as working fine. Systems (prior to Catalina and then prior to the boot changes made to Mojave) use to boot with monitors only attached to the eGPU. Apple broke it and has yet to fix it.

My experience was identical to @BradDE. The only way I could boot was to completely disconnect the BreakAway Box until the Mac booted then replug it which was a PITA. This is why I am so pleased with the current behavior.