Black screen at login unless I unplug a screen

I installed via the guide. And I have a working system. Except for one annoying issue.

I've two monitors hooked up via displayport. Boot messages show up fine. But when I get to the login screen I get black screens. The computer seems to be working aside from the video output. What resolves it is if I unplug one screen and then replug it in. That gets the monitor output working and all is well.

But this is annoying to have to do every time I start my computer. Is there any fix to this?

Author: @cals11