@666philb Thanks for your reply. The output of nvidia-xconfig is as follow:
Code: Select all
# nvidia-xconfig
Using X configuration file: "/etc/X11/xorg.conf".
VALIDATION ERROR: Data incomplete in file /etc/X11/xorg.conf.
Undefined Device "(null)" referenced by Screen "Screen0".
Backed up file '/etc/X11/xorg.conf' as
'/etc/X11/xorg.conf.nvidia-xconfig-original'
Backed up file '/etc/X11/xorg.conf' as '/etc/X11/xorg.conf.backup'
New X configuration file written to '/etc/X11/xorg.conf'
The new xorg.conf is unable to load X