OS X fonts look different on external Monitor

When the Macbook Pro connects to an external LCD monitor, fonts look very strange in some program  (Like Terminal) on the external monitor. It happened on 2015 Macbook Pro w/ OS X El Capitan 10.11.6.  Monitor AOC E2429SWHE.

It appears the fonts on an external monitor are not smoothing because system mistakenly recognizes the monitor as CRT.

To solve: In Terminal

defaults -currentHost write -globalDomain AppleFontSmoothing -int 2

The number 2 here corresponds to Medium – Best for Flat Panel. You may also use 1 for light smoothing, and 3 for strong smoothing, as per the original OS X font smoothing options.

Relaunch the program to take effect.

 

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