How can I compensate for red blue font discoloration in 2018 MBP Displayport? I recently moved from a 2017 macbook pro to a 2018 macbook pro with a configuration like this:

# Works perfectly    
MBP 2017 -&gt; USB C -&gt; Displayport -&gt; Dell Ultrasharp U2415

# Red / blue font discoloration
MBP 2018 -&gt; USB C -&gt; Displayport -&gt; Dell Ultrasharp U2415


On the 2017 MBP the colors work perfectly, but on the 2018 MBP, my letters arbitrarily turn red or blue. See picture below taken with an iPhone. What's going on?


Display calibration (basic and advanced) makes no difference
Monitor calibration makes no difference
When dragging a window, the red/blue/black changes in the characters


Here's a video of the effect on this question if the example below is to blurry.

Actual (taken with an iphone cam, ignore the grid, but notice the red and blue in the letters) :



Expected (yes a screenshot, but the text should be just plain black):
Go to System Preferences -> General -> and uncheck "Use LCD font smoothing when available" (bottom of the pane). Close all apps and restart your Mac. Then it works for me.