We have a IMX8QM board with Linux 4.19.35.
And the system have two LVDS interface (LVDS-1, LVDS-2) connected to two 800x400 LCD panel separately.
Each LVDS display works well with 'modetest' cmd.
modetest -M imx-drm -s 149@65:1280x768-60 //LVDS1
modetest -M imx-drm -s 151@123:800x480-60 //LVDS2
However, it is impossible to show the test pattern image on two LVDS panels SIMULTANEOUSLY.
My questions are:
1. How to make two LVDS interfaces work at the same time?
2. No frame buffer device (/dev/fb*) for my display devices.
The rootfs is built from yocto (bitbake imx-image-multimedia),
and only one frame buffer device (/dev/fb0) appears.
How to enable frame buffer devices for two LVDS interfaces?