Testing - notro/fbtft GitHub Wiki
Framebuffer Test suite by Geert Uytterhoeven
apt-get install libnetpbm10-dev
git clone https://git.kernel.org/pub/scm/linux/kernel/git/geert/fbtest.git
cd fbtest
# fb.c - remove #include <asm/page.h>
make
./fbtest --fbdev /dev/fb1
The displays I own are tested before each new release.
I use test scripts from https://github.com/notro/fbtft_test