I have a MacBook Pro (13-inch, 2017, Two Thunderbolt 3 ports) version 10.14.5.
A first monitor (DELL P2719HC) is connected through thunderbolt 3 while a second monitor (DELL E2313H) is connected through a VGA adapter. The latter is the one flickering!
Flickering stops when I disconnect the first monitor. Thus, it's not a problem of the adapter, nor the screen. I am guessing this is due to my laptop not being able to give enough fps to both screens (they both require a 60Hz refresh rate at minimum, which I cannot change event with some command line tools).
I tried to reset VRAM and SMC, but it did not work.
What else can I do?