Indecisive Mac - Can’t cleanly boot into both macOS and Windows
 
Notifications
Clear all

Indecisive Mac - Can’t cleanly boot into both macOS and Windows  

  RSS

Gymnastboatman
(@gymnastboatman)
New Member
Joined: 3 months ago
 

Setup: 

Mac mini 2018 (FileVault OFF)

macOS 11 Public Beta

Sapphire Nitro+ RX 580 4GB

Sonnet 350W eGFX Breakaway Box

2 Monitors: 1 DisplayPort 1080p, 1 DVI → HDMI 1024p

 

Windows will only finishing booting if both displays are plugged into the RX 580. If the HDMI is in the Mac, the Windows logo cycles indefinitely and never reaches the spinning circles.

MacOS will only boot if the one monitor is plugged into HDMI and the other into the RX 580. Once booted, I can move the monitor back the the RX 580 no problem. 

I don’t particularly care which is which, as long as I can just leave it because the box & Mac mini at behind my monitor and are hard to reach. 
I do also have a Devil Box that I found cheap on the way to do testing with as well. 

I do know I’m running the public beta, but it’s largely stable, and I’ve seen reports of similar issues on Catalina as well. 

To do: Create my signature with system and expected eGPU configuration information to give context to my posts. I have no builds.

.

ReplyQuote
Mini i5
(@mini-i5)
Honorable Member
Joined: 1 year ago
 

@gymnastboatman

Which Windows build are you running?

 

2018 Mac Mini i5 / 6-core 3.0-4.1 Ghz / 32GB / 256GB / Intel UHD 630 / PowerColor Gaming Station / PowerColor dual-fan RX 5700 XT / Mac OS 10.15.6 Catalina / Windows 2004 😏 / Dual LG 27" 4K displays


ReplyQuote
Gymnastboatman
(@gymnastboatman)
New Member
Joined: 3 months ago
 

@mini-i5, 1903, currently updating to 2004, I thought I already was. 

 Edit: Unresolved on 2004

This post was modified 3 months ago

To do: Create my signature with system and expected eGPU configuration information to give context to my posts. I have no builds.

.

ReplyQuote
Mini i5
(@mini-i5)
Honorable Member
Joined: 1 year ago
 

@gymnastboatman

Are you running both OS off the internal SSD?

Below is what works with my setup in 10.15.6. You might try it with the Big Sur Beta. 

Shut down in Mac OS. Unplug the eGPU and any other TB3 devices. 

Keep the HDMI cable attached between the Mini and one display.

Unplug the display cable from your eGPU.

Start-up and sign in to the Mac OS desktop.

Hot plug your eGPU (with no display cables attached) into the Mini.

Confirm your eGPU is recognized by Mac OS, and then shut down. 

Disconnect the HDMI cable from the Mini. Connect both displays to your eGPU. 

Restart and wait (with black screens) for the minute or so Mac OS takes to boot up and appear on your displays. You can hot plug any additional TB devices such as external storage. 

After those steps, Catalina “remembers” the setup, and boots up normally in Mac OS, and boots into Windows normally as well - with no unplugging and replugging of displays. 

 

 

 

2018 Mac Mini i5 / 6-core 3.0-4.1 Ghz / 32GB / 256GB / Intel UHD 630 / PowerColor Gaming Station / PowerColor dual-fan RX 5700 XT / Mac OS 10.15.6 Catalina / Windows 2004 😏 / Dual LG 27" 4K displays


ReplyQuote
Gymnastboatman
(@gymnastboatman)
New Member
Joined: 3 months ago
 

@mini-i5, Followed your instructions, unfortunately ten minutes later I am still waiting to get into macOS after booting with both monitors in the eGPU. 

I even force restarted the Mac to give it another chance to boot up. No picture. 

 

To do: Create my signature with system and expected eGPU configuration information to give context to my posts. I have no builds.

.

ReplyQuote
Mini i5
(@mini-i5)
Honorable Member
Joined: 1 year ago
 

@gymnastboatman

It might be an issue with Sonnet’s firmware. Trying with the Devil Box may give better results. 

 

2018 Mac Mini i5 / 6-core 3.0-4.1 Ghz / 32GB / 256GB / Intel UHD 630 / PowerColor Gaming Station / PowerColor dual-fan RX 5700 XT / Mac OS 10.15.6 Catalina / Windows 2004 😏 / Dual LG 27" 4K displays


ReplyQuote
prototofu
(@prototofu)
Active Member
Joined: 3 months ago
 

Can't quite picture your setup, but the first reboot into macOS from Windows seems to be problematic for me as well. All other reboots work fine.

It seems you can engage the iGPU by having that HDMI cable plugged in (which is apparently the opposite of how Windows likes to boot), but my solution is to just turn my Razer Core X on and off at the switch when I get black screens when rebooting from Windows into macOS. This is basically just like hot-plugging, and immediately wakes the monitors up. Because I'm not yet in the OS properly, I don't get any disconnection warnings (and presume this is pretty harmless).

I understand that you might not be able to access the Sonnet power, or the TB3 cable to do this, but maybe you can access a switch on the power point for the Sonnet? Bit janky, but should get the job done.

To do: Create my signature with system and expected eGPU configuration information to give context to my posts. I have no builds.

.

ReplyQuote
Gymnastboatman
(@gymnastboatman)
New Member
Joined: 3 months ago
 

@prototofu, I suppose, but honestly the idea here is that the eGPU on macOS should be plug-and-play. The only reason I’m here is because my software is beta so I can’t call Apple. I guess I’ll just be waiting until Big Sur is out of beta and contacting Apple. Because there is no reason that I can’t have both monitors in the eGPU and boot into macOS. 

 

To do: Create my signature with system and expected eGPU configuration information to give context to my posts. I have no builds.

.

ReplyQuote