Hello,
I have exactly the same problem with Ubuntu 14.04.5 LTS and the Nvidia 390/396 driver, on 3 computers:
One HP Omen 17" and two HP Omen 15".
Three laptops with an Intel Graphics (7th gen) and a Nvidia GTX 1050.
Kernel version: 4.4
Before the Nvidia 390 version I didn’t see this problem.
On the Nvidia GPU: No problem.
On the Intel GPU: Unable to open nvidia-settings. Unable to run nvidia-smi.
With:
export LD_LIBRARY_PATH=/usr/lib/nvidia-396/
I can run nvidia-smi, but nvidia-settings print:
ERROR: Unable to load info from any available system.
But,
prime-select nvidia
works to go back on the nvidia-gpu.