Cannot open nvidia-settings on two 2080Ti and Ubuntu 18.04


I can’t run nvidia settings. I have two GeForce RTX 2080 Ti graphics cards, and my system is Ubuntu 18.04, my cpu is AMD 3800X.

When I try to open nvidia-settings, it shows

ERROR: Unable to load info from any available system

And I try to run sudo prime-select nvidia, it returns

Info: the nvidia profile is already set

The nvidia-smi and driver are well working.

The I try to run

sudo nvidia-xconfig --enable-all-gpus --cool-bits=28 --allow-empty-initial-configuration

but it doesn’t work.

This is my bug report.
nvidia-bug-report.log.gz (460.5 KB)