Comment 20 for bug 1758496

Again, I test the 4.16 kernel with the parameter "nomodese". As Kaihengfeng guessed the system boot but the problem still there; /sys/class/backlight folder was empty. My second test was boot again with 4.16 without "nomodeset" parameter in the grub file and the results were others. As I expected the system was frozen and in this last test the brightness keys didn't work.
It smells like a problem betwen my firmware and the kernel.
I can do more test to find the problem.