In my project I am employing a CM2009 IC between true VGA controller and VGA output connector. It really is described inside the datasheet for this IC that I can use EMI filters on HSYNC, VSYNC and DDC channels appropriate just after IC and right before VGA connector. However there https://sergiojlhav.bleepblogs.com/31733436/emc-emi-filter-wikipedia-fundamentals-explained