I shared a report on Xorg slowness, freezing and crashing with external monitor, Thinkpad w/ Optimus (GM107GLM [Quadro M2000M]) - #9 by mxmilkiib but I’ll add another one just now.
I’ve also put more detail about my varient of external screen freeze problem as it’s more similar to the original post I made for an earlier driver than this 530.x “needs the mouse to move to update the image” issue.