How to set HDMI Monitor as default?

How to set HDMI Monitor as default?

I'm using Ubuntu 13.04 x64 on notebook with nVidia Quadro FX770M and
driver nvidia-310.
I have the notebook docked to docking station and I'm using two displays,
main on HDMI and addtional on VGA. Unfortunately, driver assumes that main
screen is on VGA, which is not a problem until I'm using desktop
(duplicate launcher menu), but there is huge problem when I'm trying to
play some FullScreen game.
So, when I open nvidia-settings I see:
Default nvidia-settings screen
What I want to see is:
Needed nvidia-settings
When I click to save changes to xorg.conf file it changes nothing (I tried
to save that file in my home folder and diff it with original xorg.conf,
but there are the same!)
Here is my current xorg.conf, can you help my how I need to change it to
make HDMI (BenQ display) my default? I'm worried, why there are no BenQ
display Section.
# nvidia-settings: X configuration file generated by nvidia-settings
# nvidia-settings: version 310.44 (buildd@batsu) Wed Apr 10 17:23:05
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 L1953S"
HorizSync 30.0 - 83.0
VertRefresh 56.0 - 75.0
Option "DPMS"
EndSection
Section "Device"
Identifier "Device0"
Driver "nvidia"
VendorName "NVIDIA Corporation"
BoardName "Quadro FX 770M"
EndSection
Section "Screen"
Identifier "Screen0"
Device "Device0"
Monitor "Monitor0"
DefaultDepth 24
Option "Stereo" "0"
Option "nvidiaXineramaInfoOrder" "DFP-2"
Option "metamodes" "CRT: nvidia-auto-select +1920+0, DFP-2:
nvidia-auto-select +0+0"
SubSection "Display"
Depth 24
EndSubSection
EndSection