Yes, I run nvidia-settings from terminal with sudo and I just noticed that every time I click on Save to X Configuration File, the terminal displays this error message:
Package xorg-server was not found in the pkg-config search path.
Perhaps you should add the directory containing `xorg-server.pc'
to the PKG_CONFIG_PATH environment variable
No package 'xorg-server' found
When I try to save in the path /etc/X11/xorg.conf appears the error message:
ERROR: Unable to open X config file '/etc/X11/xorg.conf' for writing.
I don’t know how to report this error on Launchpad. If anyone can do that, I’d appreciate it.