The changes of the following files are responsible for the boot issue. 

- drivers/gpu/drm/drm_*
- include/drm/*

The kernel doesn't boot with the updates in the files above from the
drm-next-2019-09-18 so I can't attach the output of dmesg and the Xorg log
file.

Which of the files in

- drivers/gpu/drm/drm_*
- include/drm/*

are responsible at the beginning of the kernel boot? Is there a patch in the
dri git for the files above?

I can bisect but actually I need only to know which of the files above are
responsible at the beginning of the kernel boot.

Could someone please test the latest Git kernel with a Radeon HD NI graphics
card?

Thanks