Вот что пишет nvidia-settings:
You do not appear to be using the NVIDIA X driver. Please edit your X configuration file (just run `nvidia-xconfig` as root), and restart the X server.
live@pra-roll:~$ lsmod |grep nvidia
nvidia 9924608 21
drm 331776 2 nvidia
live@pra-roll:~$ inxi -G
Resuming in non X mode: glxinfo not found. For package install advice run: inxi --recommends
Graphics: Card: NVIDIA GF108 [GeForce GT 630]
Display Server: X.org 1.20.0
drivers: vesa,nouveau (unloaded: modesetting,fbdev) FAILED: nvidia
tty size: 86x23
live@pra-roll:~$