Question Monitor on DP will only work if connected with second monitor

Jan 2, 2020
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I have struggled with screen flickering on my viewsonic 144hz monitor. Everything is fine when I use hdmi but when trying displayport I get terrible flickering. At first I could not even get it to the desktop to change any settings.

I am on my third DP cable

I finally got everything to work by connecting a second monitor through hdmi and extending the desktop. On the viewsonic i then lowered the refresh rate to 120 and changed the color from rbg to YCbCr422.

Problem now is if I disconnect the second monitor the flickering comes back. Does anyone have any ideas how to fix this?
I do not want the second monitor connected

Ryzen 7 2700
16Gb RAM
GeForce RTX 2060 (Driver 441.66)
 

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