No, I am sorry, you guys got it all wrong.
This is not a "serious problem". In fact, Nvidia changes the recent drivers that the trick with changing saturation etc. via control panel and a HDMI cable doesn't work any longer..... AT REQUEST BY OCULUS - as I was told by an Nvidia rep!
I think this is a serious problem and I dont understand why both nvidia and oculus don't even mention it as a "known issue".For now, I followed this method, but for some rift headset can create new problems (but is reversable, so you can try at least)