Replying to nudge this. I've been seeing the exact same problem. WX 3100 GPU in a HP Zbook. Hard to tell when it started but seems like a Fall Windows update.
Anyone new to this thread probably already knows which led them to search for an AMD GPU issue but figuring out why 'system' was going nuts in the Windows Performance Monitor was not easy for non IT people like me. Well I'll walk through what I found and how I found it in hopes that some AMD people can actually fix it. This is what my mine looked like. Consistent 'very high' "system" CPU usage. The 'gpu' usage tracker is showing normal load, only jumps a bit when you actually do graphics stuff. But the 'system' consistently stayed around 20%, even when doing nothing with the browser closed. Some other googling indicates this may be an AMD service constantly polling if it has the latest driver or something like that. If true it'd be pretty ironic.
This was a hint that it was graphics drivers thought, but not from AMD. Before I did my first driver update, Intel graphics was a big contributor.
The intel pro-set funny business went away but 'system' business remained. But 'system' going nuts tells us nothing. There's a ton of stuff going on there. So my pal Google found this helpful thread on how to dig deeper: https://superuser.com/questions/527401/troubleshoot-high-cpu-usage-by-the-system-process . So I installed the " windows performance toolkit from this link as suggested by the article. Installing this windows performance toolkit from this link as suggested by the article
At first it looked like NTOSKRL was the culprit, which was disappointing as that's pretty vague.
But then I realized I could keep opening the branches of that tree. Oh look here, it was "atikmpag.sys" gooning me all along!
First thing I tried was updating the driver and saw that it was over a year old! Apparently that annoying 'HP Support Assistant' software that regularly nags me with system's whole purpose is to keep everything everything fresh BUT the GPU. Updated the driver through AMD website and seemed like it fixed the heavy cpu use issue. Installed the AMD management software to have something at least checking for updates. Seemed to make it worse. In retrospect, probably coincidental.
It was still having same issue with the most updated driver (like from November 2020). The issue goes away by disabling the GPU in device manager. Thanks to the original poster for mentioning you can also disable the Intel UHD Graphics 620 instead. At least we have SOME option for running CAD right now. My last attempt at fixing was to update the driver within the device mgr using the Windows service and that reverted it to version 27.20.11023.9002 published 9-9-20. I figured if it was from Microsoft then theoretically it's the latest 'tested' driver that plays nice with the most recent window update? Well maybe, but that didn't fix it either.
So no, I have no fix for this as of yet.
