2020 iMac boot camp

JamesFMann wrote:

I've tried downloading all kinds of AMD drivers, but they fail.

Have you tried https://www.amd.com/en/support/kb/release-notes/apple-boot-camp ?

Where are the drivers for the 5300M? Is there any known workarounds for the BCA not loading or the AMD drivers?

An external disk installation has known issues. Do you want to consider installing it on the internal disk and testing the BC drivers?

I am running Boot Camp on the internal SSD and I am running the 5700 XT. I have tried installing every driver available and they all fail to "detect my hardware." AMD drivers on these new iMacs are nonexistent and running Windows on them is pretty useless right now.

Way to go Apple and AMD! Release a new product with no supported driver for one of your products.

Volkswagen04 wrote:

I am running Boot Camp on the internal SSD and I am running the 5700 XT. I have tried installing every driver available and they all fail to "detect my hardware." AMD drivers on these new iMacs are nonexistent and running Windows on them is pretty useless right now.

AMD is now wholly responsible for Windows drivers.

Way to go Apple and AMD! Release a new product with no supported driver for one of your products.

This has been an issue with AMD since their partnership with Apple. I prefer the Apple-nVidia relationship.

Thanks but I tried both the Red and Blue drivers and they both have major issues.

The Red splits my iMac screen into two mirrored screens. There is no way to adjust it in the settings or fix it as far as I can tell. I had to remove that driver completely. I then installed the Blue driver and my fans run at 100% even though my CPU and GPU have zero load and are in the 40 degrees celsius range.

Both of those drivers are broken.

I have finally got mine running properly except Bluetooth, but I have a work around for that.

I installed the AMD Red drivers from https://bootcampdrivers.com but the screen was split and the fans ran full tilt.

Also I had numerous other devices in the device manager with no drivers.

I booted it into MacOS and used the BootCamp assistant to download the latest Windows Support software. Went back into Windows and installed them. That resolved the Split Screen and fans going crazy it also eliminated all but one of the Other device with no drivers. Also nothing Bluetooth worked including the Apple Mouse and Keyboard.

I plugged in the keyboard and used a wired mouse to once again boot into MacOS.

Go into Settings under Bluetooth and delete the keyboard and mouse, then add them and any other Bluetooth devices you want to use.

Booted back into Windows and everthing worked, even though you can't access Bluetooth settings. I suspect that the one thing that doesn't have a driver in the device manager is the Bluetooth adapter.

I know this is convoluted but, hey it worked!

Still looking for that elusive Bluetooth driver :(

Thank you for your efforts here and the details that you have provided.

I honestly was so angry yesterday, uninstalling and reinstalling drivers that I was about to return the iMac and just go buy a MacBook Pro and then build a Windows computer with the new Nvidia cards that were announced yesterday. You might have single-handedly prevented that from happening. Lol.

I am going to give it a go later today, and I will report back my findings.

JamesFMann wrote:

Have the updated the version of boot camp drivers yet? Mine was version 1082 I believe.

This is what I see

[Version]
Signature="$Windows NT$"
Provider=%ATI%
ClassGUID={4D36E968-E325-11CE-BFC1-08002BE10318}
Class=Display
DriverVer=07/09/2020, 26.20.15032.2015
;;LayoutFile=layout.inf
CatalogFile=C0356536.CAT

So, I did everything that you said, PJ_in_RC.

My Bluetooth is working fine, but my split-screen is still an issue. Rather than show two mirrored images, however, I see the left screen, and it is stretched horizontally. Under the Display Settings, it shows two 2560x2880 displays. I cannot figure out how to resolve that issue. The fans are also working normally for me.

Let me ask you this. Did you just run the "Setup.exe" under the "Bootcamp" folder, or did you drill down into other folders and install other drivers one by one?

As I was writing this post, I think I figured out the stretched screen, but under "Display Resolution," the highest resolution option that I have is 3840 x 2160. No 5K option.

I just wish this would work. I cannot believe the amount of time I have invested in trying and getting this to work.

The 3840 x 2160 is the resolution I have and it works fine. Yes I did just run the setup.exe in the Windows Support Bootcamp folder.

You said you had the Bluetooth working, did you find a driver or did you use my work around?

Glad I was able to help.

I didn't do anything. I installed the driver, and Bluetooth was working after rebooting the computer.

Additionally, I tried a few Windows applications that I need to use for work, and as soon as there is any graphics load, the app crashes. I figured that this was a one-off issue, so I installed a few games from my Steam library. The same thing happens when I launch any games that are graphics-heavy—very strange behavior.

Loner T wrote:

I am not aware of a 5K resolution supported in Windows. It should be 4K, which is what you seem to have.

5120x2880 has always been supported by the official Apple/AMD Boot Camp graphics drivers in Windows 10 on both my 2015 and 2019 5K iMacs.

You can see the 2020 5K iMac running in 5120x2800 with the stock Boot Camp drivers in Windows 10 in this video review by Vadim of Max Tech.

There are at least two reports on BootCampDrivers.com of their modified August 2020 drivers supporting 5K in the 2019 iMacs, and I don't recall reading any reports there of 5K not working on the 2020 models with their modified drivers.

Loner T wrote:

Can you check the Active Signal Resolution when running in 5K on Windows?

The Active Signal Resolution when running in 5K on Windows is 2560x2880.

As I recall, Apple’s custom timing controller for the 5K display treats it as two 2560x2880 displays side-by-side. The display driver takes these and presents a single 5120x2880 display to the OS (or something like that).

(There’s currently an amusing quirk on my 2019 iMac with the official Apple/AMD Boot Camp drivers: if I have Night Light turned on and launch a game at 2560x1440, then alt-tab back to my desktop at 5120x2880, the left half of the display will have the Night Light applied and the right half will not. Fortunately, this is quickly remedied by toggling Night Light off and back on.)

Colonel Blimp wrote:

The Active Signal Resolution when running in 5K on Windows is 2560x2880.

As I recall, Apple’s custom timing controller for the 5K display treats it as two 2560x2880 displays side-by-side. The display driver takes these and presents a single 5120x2880 display to the OS (or something like that).

Yes, the TMCON was what I was referring to. The native 5K in macOS is not the same as this 'doubled' display.

(There’s currently an amusing quirk on my 2019 iMac with the official Apple/AMD Boot Camp drivers: if I have Night Light turned on and launch a game at 2560x1440, then alt-tab back to my desktop at 5120x2880, the left half of the display will have the Night Light applied and the right half will not. Fortunately, this is quickly remedied by toggling Night Light off and back on.)

I have seen that many a time. My 2014 iMac does not support 5K on Windows, even though macOS is native 5K. 4K in Windows is plenty for my use. 😉

I got them from https://www.bootcampdrivers.com/

they were just released this month