I tested the following mainline packages:

linux-headers-4.16.0-041600_4.16.0-041600.201804012230_all.deb
linux-headers-4.16.0-041600-generic_4.16.0-041600.201804012230_amd64.deb
linux-image-4.16.0-041600-generic_4.16.0-041600.201804012230_amd64.deb

Still unbootable except in recovery mode.

The only difference, 4.16 generates new messages about missing firmware
that neither 4.13 nor 4.15 generated:

W: Possible missing firmware /lib/firmware/nvidia/gp108/sec2/sig.bin for module 
nouveau
W: Possible missing firmware /lib/firmware/nvidia/gp108/sec2/image.bin for 
module nouveau
W: Possible missing firmware /lib/firmware/nvidia/gp108/sec2/desc.bin for 
module nouveau
W: Possible missing firmware /lib/firmware/nvidia/gp108/nvdec/scrubber.bin for 
module nouveau
W: Possible missing firmware /lib/firmware/nvidia/gp108/gr/sw_method_init.bin 
for module nouveau
W: Possible missing firmware /lib/firmware/nvidia/gp108/gr/sw_bundle_init.bin 
for module nouveau
W: Possible missing firmware /lib/firmware/nvidia/gp108/gr/sw_nonctx.bin for 
module nouveau
W: Possible missing firmware /lib/firmware/nvidia/gp108/gr/sw_ctx.bin for 
module nouveau
W: Possible missing firmware /lib/firmware/nvidia/gp108/gr/gpccs_sig.bin for 
module nouveau
W: Possible missing firmware /lib/firmware/nvidia/gp108/gr/gpccs_data.bin for 
module nouveau
W: Possible missing firmware /lib/firmware/nvidia/gp108/gr/gpccs_inst.bin for 
module nouveau
W: Possible missing firmware /lib/firmware/nvidia/gp108/gr/gpccs_bl.bin for 
module nouveau
W: Possible missing firmware /lib/firmware/nvidia/gp108/gr/fecs_sig.bin for 
module nouveau
W: Possible missing firmware /lib/firmware/nvidia/gp108/gr/fecs_data.bin for 
module nouveau
W: Possible missing firmware /lib/firmware/nvidia/gp108/gr/fecs_inst.bin for 
module nouveau
W: Possible missing firmware /lib/firmware/nvidia/gp108/gr/fecs_bl.bin for 
module nouveau
W: Possible missing firmware /lib/firmware/nvidia/gp108/acr/ucode_unload.bin 
for module nouveau
W: Possible missing firmware /lib/firmware/nvidia/gp108/acr/ucode_load.bin for 
module nouveau
W: Possible missing firmware /lib/firmware/nvidia/gp108/acr/unload_bl.bin for 
module nouveau
W: Possible missing firmware /lib/firmware/nvidia/gp108/acr/bl.bin for module 
nouveau

I tried installing nouveau-firmware with no difference.

** Tags added: kernel-bug-exists-upstream

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https://bugs.launchpad.net/bugs/1763189

Title:
  kernel 4.15 breaks nouveau on Lenovo P50

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