c'est ce que je me suis dit aussi.
pour nvidia-xconfig ça me met:
Warning: Unable to locate/open X configuration file.
Package xorg-server was not found in the pkg-config search path
perhaps you should add the directory containing 'xorg-server' to the PKG_CONFIG_PATH environment variable
No package 'xorg-server' found
New X configuration file written to '/etc/X11/xorg.conf'
et quand je relance ça me dit:
Using X configuration file: "/etc/X11/xorg.conf".
Backed up file '/etc/X11/xorg.conf' as '/etc/X11/xorg.conf.backup'
New X configuration file written to '/etc/X11/xorg.conf
Merci!