Bootcamp Windows 10 on iMac 27" (2017) – 4:3 resolutions stretched + black screen issue

[Herver]

Hi everyone,
I’m running Windows 10 through Bootcamp on a 27" iMac (2017).
When I set the display to a 4:3 resolution, the image and apps get stretched instead of keeping the proper aspect ratio.

I’ve tried enabling Preserve aspect ratio, but it doesn’t work as expected — instead, the screen starts flashing black every ~2 seconds.
I already tested a few different driver versions, but no luck so far.

Is anyone else running into the same problem? Or maybe found a workaround?

 

[Bigwaff]

I’m running Windows 10 through Bootcamp on a 27" iMac (2017).
When I set the display to a 4:3 resolution, the image and apps get stretched instead of keeping the proper aspect ratio.

27" iMac display aspect ratio is 16:9. That is why the 4:3 aspect ratio gets stretched.

 

[Herver]

27" iMac display aspect ratio is 16:9. That is why the 4:3 aspect ratio gets stretched.

Yes, and you need to tell driver to "Preserve aspect ratio" in order to keep the correct ratio. And it's not working for me.