[Solved] eGPU error 12 fail after update to Windows 10 1903 or newer (OS Build 18362.329 or newer) inc downgrade pci.sys version solution  

Folks,

It looks like Windows 10 20H1 build 19041.423 finally fixes PCI.SYS issue!

I do not see MSFT mentionining it in the release https://support.microsoft.com/en-ca/help/4568831/windows-10-update-kb4568831 , but after installing the update, I checked PCI.SYS, and it is showing new version. Typically when Windows Update replaces 19H1 PCI.SYS, my XConnect setup stops working right away (the host laptop has internal dGPU), and this time, everything continues to work

@sky11, Wonderful news and great to hear from you! I will try this on a couple Macs and report back.

Below is the link to download the standalone package for KB4568831 [OS Build 19041.423].

http://www.catalog.update.microsoft.com/Search.aspx?q=KB4568831

@sky11, encouraging news!👍

I ran Windows 10 Standalone Update KB4568831 [OS Build 19041.423] on the 2018 Mac mini and can confirm Radeon eGPU now works in Boot Camp without error 12. The preparation was to remove Radeon drivers through DDU. Once the Windows update completed, I hotplugged the Radeon RX Vega 56 eGPU then proceeded to install Radeon drivers. The Radeon Installer reported error 207 but the eGPU worked through cold-plug.

Using the modified apple_set_os v0.5 boot loader, I could cold boot with the eGPU connected and keep Intel iGPU activated in Windows. If you don't use an EFI boot loader, the Radeon eGPU still works through cold-plug but the Intel iGPU would be deactivated. I tried hot-plug but that resulted in error 12.

Tried it with my 2019 Macbook Pro 16 with the jan 2020 bootcampdrivers.com driver, and the latest July official AMD drivers. Bootcampdrivers.com drivers installed but got error 12. Official amd installer would only yield error 173, could sideload them in device manager from the install folder but still got error 12.  Tried disabling left side thunderbolt pcie root, and using the right hand ports, tried disabling the right hand side pcie root and using the left hand ports.  Also disabled the wifi root port.  Tried cold-plug and hotplug, no dice.  Tried running on the GTX 2080 egpu  and disabling the onboard Radeon Pro 5500m to see if the Radeon VII would initialize but no luck there either.  Wasn't brave enough to reboot with the dgpu disabled though.

I would see if anything changed with the Asrock Mini ITX PC but the motherboard is currently being RMA'd, and it already works pretty well cold-plugged.

@ningauble77, Definitely not as good as Win10 1903 V1 PCI.SYS in my testing so far. I'm using the RX 5700 XT with the 2019 16-in MacBook Pro and it's not able to clear error 12 with dGPU running. This new Win10 2004 may work better for non-Macs and iGPU-only Macs but dGPU-Macs should remain on 1903 .30 to .295.

Just confirming that it works for me now without any modifications. Setup:

Mac Mini 2018

Razer Core X with Vega 64

Build: 19041.423

Like mentioned above, pci.sys file has been updated by MS in the last update. So, it's probably fixed by them; finally.

Posted by: @s_mahmoud_miri

Mac Mini 2018

Razer Core X with Vega 64

Build: 19041.423

Same setup, and it WORKS!!

I can confirm the issue isn't present in the 19041.423 build.

What I did (with 3-4 reboots in the process):

• Re-enabled all Windows Update-related functions
• Installed all updates it has shown
• Updated to the May 2020 release ( https://www.microsoft.com/software-download/windows10 )
• Additionally installed a Servicing Stack Update ( https://www.catalog.update.microsoft.com/Search.aspx?q=KB4568831 )
• Relaunched Windows Update to install the rest
• Didn't touch any GPU-related things (DDU, Graphics driver etc.)

Posted by: @deduwka

I can confirm the issue isn't present in the 19041.423 build.

 

What I did (with 3-4 reboots in the process):

• Re-enabled all Windows Update-related functions
• Installed all updates it has shown
• Updated to the May 2020 release ( https://www.microsoft.com/software-download/windows10 )
• Additionally installed a Servicing Stack Update ( https://www.catalog.update.microsoft.com/Search.aspx?q=KB4568831 )
• Relaunched Windows Update to install the rest
• Didn't touch any GPU-related things (DDU, Graphics driver etc.)

The above worked for me also.

Had to use DDU though to clean up existing drivers and performed several reboots for updates, and then for the Radeon drivers to kick in.

• Mac Mini 2020
• Razer Core X Chroma with 5700XT
• Build: 19041.423

Thanks for sharing ! 😀