Comment 72 for bug 1812359

Next, please try some newer kernels (you only have kernel 4.18 with Ubuntu 19.04) from here:

  https://kernel.ubuntu.com/~kernel-ppa/mainline/?C=N;O=D

and then use the simple test of:

  grep . /sys/class/drm/*/enabled

to tell us if a newer kernel has changed things.