Is there a guide a build the 4.15.x kernel using the drm-4.17-wip? I can try to compile/test it next weekend. The problem I have is that when I display a certain png with "imagemagick display" X11 hangs. The screen is not longer updated and only a reboot helps. When I run the program using strace the last system call displayed is: ioctl(6, DRM_IOCTL_AMDGPU_WAIT_CS. That is why I am thinking it might have to do with the amdgpu.