I have connected an external monitor to my laptop through HDMI. Currently either my Desktop is getting extended to the external monitor (with native resolution) or low resolution on both when I choose "Same Image in both".

How can I ensure that the external monitor is used by default and the laptop monitor just blanks.

I generated the xorg.conf file by doing:

X -configure

The following is the content of xorg.conf.new file generated in my user folder. Should I copy this anywhere? Should I edit the contents?

Section "ServerLayout" Identifier
"X.org Configured" Screen 0 "Screen0" 0 0 InputDevice "Mouse0" "CorePointer" InputDevice
"Keyboard0" "CoreKeyboard" EndSection

Section "Files" ModulePath
"/usr/lib/xorg/modules" FontPath
"/usr/share/fonts/X11/misc" FontPath "/usr/share/fonts/X11/cyrillic" FontPath
"/usr/share/fonts/X11/100dpi/:unscaled" FontPath
"/usr/share/fonts/X11/75dpi/:unscaled" FontPath
"/usr/share/fonts/X11/Type1" FontPath "/usr/share/fonts/X11/100dpi" FontPath
"/usr/share/fonts/X11/75dpi" FontPath "/var/lib/defoma/x-ttcidfont-conf.d/dirs/TrueType" FontPath "built-ins" EndSection

Section "Module" Load "glx" Load "dri2" Load "record" Load "extmod" Load "dbe" Load "dri" EndSection

Section "InputDevice" Identifier "Keyboard0" Driver "kbd" EndSection

Section "InputDevice" Identifier "Mouse0" Driver "mouse" Option
"Protocol" "auto" Option "Device" "/dev/input/mice" Option
"ZAxisMapping" "4 5 6 7" EndSection

Section "Monitor" Identifier
"Monitor0" VendorName "Monitor Vendor" ModelName "Monitor Model" EndSection

Section "Device" ### Available Driver options are:- ### Values: : integer, : float, : "True"/"False", ### : "String", : " Hz/kHz/MHz", ### : "%" ### [arg]: arg optional #Option "NoAccel" # [] #Option "SWcursor" # [] #Option "ColorKey" # #Option "CacheLines" # #Option "Dac6Bit" # [] #Option "DRI" # [] #Option "NoDDC" # [] #Option "ShowCache" # [] #Option "XvMCSurfaces" # #Option "PageFlip" # [] Identifier "Card0" Driver "intel" BusID
"PCI:0:2:0" EndSection

Section "Screen" Identifier "Screen0" Device "Card0" Monitor
"Monitor0" SubSection "Display" Viewport 0 0 Depth 1 EndSubSection SubSection "Display" Viewport 0 0 Depth 4 EndSubSection SubSection "Display" Viewport 0 0 Depth 8 EndSubSection SubSection "Display" Viewport 0 0 Depth 15 EndSubSection SubSection "Display" Viewport 0 0 Depth 16 EndSubSection SubSection "Display" Viewport 0 0 Depth 24 EndSubSection EndSection