Bootcamp Windows - won't boot unless GPU drivers are uninstalled

Thanks for asking. The driver version that comes with Bootcamp is 26.20.13001.53002.

I have included a screen shot along with another screenshot I found interesting when investigating as much as possible before the first reboot.

The timestamps on the driver events don't match the date and time when the screen capture was taken. Could be meaningless but I found it interesting.

Automatic updates were enabled. All of these had been run and I tested the boot cycle several times before booting back over to Mac OS to work for the day. Nothing had seemed to be broken. These are the installed updates:

If I look at the ntbtlog.txt file I can see that the the Radeon driver isn't loading properly to begin with the boot is just making it through somehow. I can upload the entire file if necessary.

They are all different.

This is what AMD has available: https://www.amd.com/en/support/kb/release-notes/apple-boot-camp

This is what bootcampdrivers.com has: https://www.bootcampdrivers.com

However, none of them work and all produce the same result. I am curious if it isn't the GPU drivers but maybe a PCI driver and when the GPU drivers are disabled/uninstalled it doesn't cause the issue?

These are the drivers listed in the BootCamp.xml file:

</Name>

<Name> "Advanced Micro Devices, Inc." Display Driver

<InfName>C0350660.inf</InfName>

<Class>Display</Class>

<ClassGUID>{4D36E968-E325-11CE-BFC1-08002BE10318}</ClassGUID>

<CatalogFile>C0350660.CAT</CatalogFile>

<Provider> "Advanced Micro Devices, Inc."</Provider>

<DriverVer>01/08/2020, 26.20.13001.53002</DriverVer>

<ServiceBinary>B350622\atikmdag.sys</ServiceBinary>

<HardwareID></HardwareID>

<isX64>yes</isX64>

</Name>

<Name> "Advanced Micro Devices, Inc." Display Driver

<InfName>U0350660.inf</InfName>

<Class>Display</Class>

<ClassGUID>{4D36E968-E325-11CE-BFC1-08002BE10318}</ClassGUID>

<CatalogFile>U0350660.CAT</CatalogFile>

<Provider> "Advanced Micro Devices, Inc."</Provider>

<DriverVer>01/08/2020, 26.20.13001.53002</DriverVer>

<ServiceBinary>B350622\atikmdag.sys</ServiceBinary>

<HardwareID></HardwareID>

<isX64>yes</isX64>

I have tried removing all AMD drivers using DDU versions 18.0.3.5 and 18.0.3.6 but only tried reinstalling the drivers provided from AMD or bootcampdrivers.com.

I will give it a shot and report back.

So the procedure I followed was after running the BootCamp installer I told it to not restart on its own. I then held down shift and rebooted the machine from the start menu so I could have it reboot that first time into Safe Mode.

On a USB flash drive I had both DDU 18.0.3.5 (which I got from bootcampdrivers.com) and the Windows Support Software which I had downloaded from the BootCamp Assistant application on the Mac OS partition on my iMac.

In Safe Mode I ran DDU three times (twice with no restart and then finally with a restart - basically the instructions given from bootcampdrivers.com). When Windows had rebooted normally I confirmed that the display was being controlled by the Microsoft Basic Display Adapter drivers through device manager. Then I navigated to the AMD setup application in the Windows Support Software file on the USB drive and ran it to reinstall the AMD drivers.

The machine would then reboot into Windows without issue. I tested it multiple times.

I am now running Windows updates to see if there is something there which will break it.

Just wanted to confirm that so far it seems to have worked. I have run all mandatory updates (not any optional ones) and Windows is booting without issue. I also have not tried to update any AMD drivers. Thank you so much for your help, Loner T!

Actually - I spoke too soon. I don't know how to change it to unsolved or open - but I left it booted in Mac OS all day while I worked and just now rebooted into Windows and it is the same problem it has been. It won't boot unless I boot it into Safe Mode still.