Below is the Final Word from one of the engineers:
Kivy only in Fullscreen or openGL segmentation fault:What is needed to fix this would be a updated VC4 (VideoCore IV) and then update the graphic drivers. I saw a VC4 version here on Github but latest changes are about two years old.
This is a dead end unless the foundation themself (Raspberry Pi) marks this as important. When I've been testing, I've tried using Gl4es and Mesa.
Kivy only in Fullscreen or openGL segmentation fault:
Below are the issues we've reported and the support responses:
Kivy apps crash - need mesa version to fix #106:
Full KMS - #Kivy with Mesa #107:
Because of this Kivy driver problem, I tried to migrate my app to pi3d but here's what I reported in May 2018 and have not had any responses:
pi3d and streaming video crash:
Where should we go to request Raspbian be scheduled for graphic drivers updates, tests, and release?