@ebiggs1 wrote:
I would not suspect the AMD processor as the first cause. Maybe it is but I doubt it. The best thing to do when you have a situation like this is to see if you can connect to another computer. If it does you know it is something in your computer but if it doesn't you know your computer is probably OK.
I would suspect the cable or the ports first. You do turn off wi-fi when you try?
Well cannot speak for the OP, but my 5D MK IV worked fine on my previous desktop (intel processor), still works fine on my laptop (intel processor). All of the USB ports both front and rear can recognize the memory card while inserted into a memory card reader with no issues, all of the USB ports can recognize a myriad of other items from my Samsung Galaxy S20 to my seagate external 5gb harddrive, which uses the same micro USB-B cable ( the one it came with was short so generally use the one from my 5D MK IV for this as well).
So as to your suspecting the cable or the ports, testing has ruled out the cable being bad (works with other devices fine, and works with the 5DMKIV on different computers), testing has ruled out any glaring overarching issues with the USB ports in general (they work fine with anything not Canon 5D MK IV, and work with the memory cards from the 5D MK IV via card reader, would like to try another model of Canon camera, but don't have one available). And I keep the wifi off by default to save battery, only turned the wifi on to see if it would connect to try and see if that would narrow down the problem.
Further if I plug the 5D MK IV in through my keyboards USB passthrough everything works as normal, except for the slow downloads compared to 3.1. I do have a USB PCIe card that I may install into one of the slots in the computer and see if that makes a difference later.
So after than and finding this issue being reported on multiple forums for over the last year, it really looks like Canon forgot to include AMD processor support on the 5D.
