There is at https://lists.debian.org/debian-user/2018/07/msg00059.html a problem with nvidia driver and latest 4.16.0-2 kernel, with a workaround at https://lists.debian.org/debian-user/2018/07/msg00067.html. Does this give you some help ?
- Bug#903121: xserver-xorg-video-nvidia: blank screen, CPU ... Richard Levitte
- Bug#903121: xserver-xorg-video-nvidia: blank screen,... Andreas Beckmann
- Bug#903121: Could it be related to this message ? Erwan David
- Bug#903121: xserver-xorg-video-nvidia: blank screen,... Andreas Beckmann
- Bug#903121: xserver-xorg-video-nvidia: blank scr... Luca Boccassi
