That sounds odd, you tried another brand of HDMI cable?
I have 2 screens to one 980TI and never come across that issue but then I'm using displayport on both. Use it for both video playback and playing older games all in fullscreen.
My settings and what most will be using (IPS/VA, etc will be 10/12-bit colour) :
I have 2 screens to one 980TI and never come across that issue but then I'm using displayport on both. Use it for both video playback and playing older games all in fullscreen.
My settings and what most will be using (IPS/VA, etc will be 10/12-bit colour) :