LOL....You got me thinking with your remark about your IBM issue....
Does it perchance use a intel based video driver..?
I actually may have created this problem myself by deleting the intel drivers years ago when I added the first Nvidia addon card (upgraded since)..It’s easy enough to test..I may do it later and load the original drivers, allow the Nvidia card to update to a win 10 driver and see if it fixes the problem....I can always just roll it back..
I can look. It’s a laptop, so all the drivers are native. I have it up on my workbench. I will get the name of the driver and get back to you.