I have a similar issue with my NP900X5N laptop with Kaby Lake and 940MX card,
on 4.20.0 and Kali Linux.

My output:
root@kali:/etc/modprobe.d# dmesg | grep nouveau  
[   35.888423] nouveau: detected PR support, will not use DSM
[   35.888447] nouveau 0000:01:00.0: enabling device (0006 -> 0007)
[   35.888582] nouveau 0000:01:00.0: NVIDIA GM108 (1180d0a2)
[   35.900141] nouveau 0000:01:00.0: bios: version 82.08.67.00.04
[   35.984081] nouveau 0000:01:00.0: fb: 2048 MiB DDR3
[   35.984104] nouveau 0000:01:00.0: bus: MMIO read of 00000000 FAULT at 6013d4
[ IBUS ]
[   35.997510] nouveau 0000:01:00.0: bus: MMIO read of 00000000 FAULT at 10ac08
[ IBUS ]
[   36.035684] nouveau 0000:01:00.0: DRM: VRAM: 2048 MiB
[   36.035686] nouveau 0000:01:00.0: DRM: GART: 1048576 MiB
[   36.035688] nouveau 0000:01:00.0: DRM: Pointer to TMDS table invalid
[   36.035690] nouveau 0000:01:00.0: DRM: DCB version 4.0
[   36.036798] nouveau 0000:01:00.0: DRM: MM: using COPY for buffer copies
[   36.036915] [drm] Initialized nouveau 1.3.1 20120801 for 0000:01:00.0 on
minor 1
[   37.551790] nouveau 0000:01:00.0: bus: MMIO read of 00000000 FAULT at 619444
[ IBUS ]