I can confirm the same behaviour on my laptop.
I changed the permissions to /etc/X11/xorg.conf (sudo chmod 666 /etc/X11/xorg.conf) and tried again but still not able to save the setting changes.
I WAS able to save the changes when starting nvidia settings as root (sudo nvidia-settings).
This looks like a bug affecting the GUI that prompts for you to enter your user password to elevate your priveleges to root - I just don't know what that program is to report a bug for it.....
I can confirm the same behaviour on my laptop.
I changed the permissions to /etc/X11/xorg.conf (sudo chmod 666 /etc/X11/xorg.conf) and tried again but still not able to save the setting changes.
I WAS able to save the changes when starting nvidia settings as root (sudo nvidia-settings).
This looks like a bug affecting the GUI that prompts for you to enter your user password to elevate your priveleges to root - I just don't know what that program is to report a bug for it.....