This did not help in my case. I have 3 DisplayPort 1.2 monitors, and half of the open windows get still tossed around randomly when the monitors wake from sleep, or when the whole PC wakes from sleep.
I'm in the same boat with my Dell P2210t- it's DisplayPort connection "disconnects" the screen, which is really annoying when you're trying to operate remotely and your config doesn't match its anymore.