Same thing here on 16.04, with nvidia driver 384.111. 
Kernel 4.4.0-112: no problems
kernel 4.4.0-116: Low res and can't login on graphical mode. 

I have tried to uninstall and reinstall nvidia drivers to no effect.

I did a diff for dmesg output on both cases. The relevant bits are:

> Spectre V2 mitigation: Mitigation: Full generic retpoline
> Spectre V2 mitigation: Speculation control IBPB not-supported IBRS 
> not-supported

and

< nvidia: module license 'NVIDIA' taints kernel.
< Disabling lock debugging due to kernel taint
< nvidia: module verification failed: signature and/or required key missing - 
tainting kernel
---
> nvidia: version magic '4.4.0-116-generic SMP mod_unload modversions ' should 
> be '4.4.0-116-generic SMP mod_unload modversions retpoline '
> nvidia: version magic '4.4.0-116-generic SMP mod_unload modversions ' should 
> be '4.4.0-116-generic SMP mod_unload modversions retpoline '


** Also affects: nvidia-graphics-drivers-384 (Ubuntu)
   Importance: Undecided
       Status: New

** Also affects: linux (Ubuntu)
   Importance: Undecided
       Status: New

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https://bugs.launchpad.net/bugs/1750937

Title:
  4.4.0-116 Kernel update on 2/21 breaks Nvidia drivers (on 14.04 and
  16.04)

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