Hervé

It's the fbmem patch that prevents the graphics glitches and defects as explained in our HD4000 patching guide; so make sure you implement it. You do not modify/patch memory count, pipe count, port count or stolenmem with LoRes/4-port layout 0x01660003, only with HiRes/1-port layout 0x01660004.
 
Therefore, your framebuffer patch for iGPU@2 should set the following parameters to the following values:
ig-platform-id -> 03006601 // LoRes/4-port Capri mobile layout framebuffer-patch-enable -> 1 // enables framebuffer patching framebuffer-fbmem -> 00008000 // reduces framebuffer memory from default 16MB to 8MB framebuffer-conX-enable -> 1   // enables conX patching, where X is your identified connector for HDMI output port framebuffer-conX-type -> 00080000 // sets conX to HDMI type, where X is your identified connector for HDMI output port hda-gfx -> onboard-1 // for HDMI-audio and nothing else. Target connector will most probably be con1.
 
In the future, please post system's specs (add those in signature!) and copy of your bootloader config so that it can be properly read with the relevant tools, rather then leave people use Base64 to Hex/Text converter to decode your patches... Here, we assessed it was a Clover config but also specify this sort of things.
 
For a complete and detailed set of information on framebuffer patching, I invite you to consult the Whatevergreen user manual:
https://github.com/acidanthera/WhateverGreen/blob/master/Manual/FAQ.IntelHD.en.md

You appear to have a Micron 2200s SSD in that Latitude 7400. Those are known to be troublesome with macOS and you should consider replacing it.
https://dortania.github.io/Anti-Hackintosh-Buyers-Guide/Storage.html

The track stick is actually supported with the ApplePS2Controller kext provided in the D620 bootpacks once you remove the VoodooPS2Trackpad PlugIn kext.