Just had same issue, whenever cursor went from white to black (or dark), screen would go black. Touchscreen woke it back up.
I went into device manager, removed the display driver for Intel Iris. It appeared to remove, I went to intel driver site, did driver updates (wifi and bluetooth), but graphics driver not shown to be updateable, nor did it get updated.
I rebooted, driver was there again, 27.20.100.8280. Problem has gone away, but that was 10 min ago, so I'll advise if I learn anything else.