Why is nvidia x server configuration not saved under linux mint?

Question

linux

Linux mint 16.x64. xfce.
Video card nvidia gtx460. driver from nvidia 331.20. Two monitors.
I launch the nvidia control panel
sudo nvidia-settings I
configure the location and resolution. I press "Apply". I press "Save to X Configuration File" and select the /etc/X11/xorg.conf file.

Here is xorg.conf

# nvidia-settings: X configuration file generated by nvidia-settings
# nvidia-settings: version 331.20 ([email protected]) Wed Dec 4 16:23:09 UTC 2013
Section "ServerLayout"
Identifier "Layout0"
Screen 0 "Screen0" 0 0
InputDevice "Keyboard0" "CoreKeyboard"
InputDevice "Mouse0" "CorePointer"
Option "Xinerama" "0"
EndSection
Section "Files"
EndSection
Section "InputDevice"
# generated from default
Identifier "Mouse0"
Driver "mouse"
Option "Protocol" "auto"
Option "Device" "/dev/psaux"
Option "Emulate3Buttons" "no"
Option "ZAxisMapping" "4 5"
EndSection
Section "InputDevice"
# generated from default
Identifier "Keyboard0"
Driver "kbd"
EndSection
Section "Monitor"
# HorizSync source: edid, VertRefresh source: edid
Identifier "Monitor0"
VendorName "Unknown"
ModelName "LG Electronics W2242"
HorizSync 30.0 - 83.0
VertRefresh 56.0 - 75.0
Option "DPMS"
EndSection
Section "Device"
Identifier "Device0"
Driver "nvidia"
VendorName "NVIDIA Corporation"
BoardName "GeForce GTX 460"
EndSection
Section "Screen"
Identifier "Screen0"
Device "Device0"
Monitor "Monitor0"
DefaultDepth 24
Option "Stereo" "0"
Option "nvidiaXineramaInfoOrder" "CRT-0"
Option "metamodes" "DVI-I-0: nvidia-auto-select +0+30, VGA-0: nvidia-auto-select +1680+0"
Option "SLI" "Off"
Option "MultiGPU" "Off"
Option "BaseMosaic" "off"
SubSection "Display"
Depth 24
EndSubSection
EndSection

After a reboot, the settings are reset to default. CHADNT?

Answer 1

There was such a side in mint 15 - I did not decide. I freaked out, made a purge nvidia *, downloaded a binary installer from the nvidia website, installed it from the terminal and it worked as it should. But this is extreme.

Answer 2

The following helped me:
in /etc/X11/xorg.conf
in the
add
Option "RegistryDwords" "PowerMizerEnable=0x1; PerfLevelSrc=0x3322" to the end