LCD Monitor Resolution

With help of launchpad.net I could set the resolution of my monitor from 800x600 to 1024x768 using the advise as under:

Try:
gksudo gedit /etc/X11/xorg.conf
add this text:
Section "Device"
Identifier "Intel Corporation 82815 CGC [Chipset Graphics Controller]"
Driver "intel"
BusID "PCI:0:2:0"
EndSection
Section "Monitor"
Identifier "Generic Monitor"
Option "DPMS"
HorizSync 31.5-48.5
VertRefresh 40-70
EndSection
Section "Screen"
Identifier "Default Screen"
Device "Intel Corporation 82815 CGC [Chipset Graphics Controller]"
Monitor "Generic Monitor"
DefaultDepth 16
SubSection "Display"
Modes "1024x768" "800x600" "640x480"
EndSubSection
EndSection
Section "ServerLayout"
Identifier "Default Layout"
Screen "Default Screen"
EndSection
Save the new file, close gedit and reboot.

My monitor is Full HD and has a capacity for 1920 x 1080 resolution. The detailed specification of this monitor is as under:-

Specifications of MONITOR
Samsung – SyncMaster B2230

Display
Screen Size
54.61cm (21.5) Wide

Brightness (Typical)
300cd/m²

Contrast Ratio (Typical)
DC 70,000:1(Typ. 1,000:1)

Resolution
1920 x 1080

Response Time (Typical)
5ms

Viewing Angle(Horizontal/Vertical)
170˚/160˚(CR>10)

Color Supported
16.7M
Signal Input
Video Signal
Analog RGB, DVI

Sync. Signal
Separate H/V, Composite, SOG

Connector
15pin D-SUB, DVI-D
Power
Power Consumption
45 watts

Stand By Power (DPMS)
<0.3 watts

Type
Built-in
Features
Plug & Play
DDC 2B

USB powered hub option
No

Mac compatibility
Yes

Multimedia Speakers
No

Wall-Mount
75 x 75

TCO
No

Cabinet Color
High Glossy Black

Optional Accessories
DVI Cable

Special Features
MagicBright³, MagicEco, MagicAngle, MagicReturnOff timer, Image Size Colour Effect, Customised key, Windows7, DVI with HDCP
Dimension
Product Dimension(With stand, WxHxD)
523.4 x 400.0 x 197.0mm

Product Dimension(Without Stand, WxHxD)
523.4 x 350.0 x 68.2mm

Shipment Dimension(WxHxD)
599 x 423 x 132mm
Weight
Product Weight
4.35Kg

Shipment Weight
5.90Kg
Stand
Type
Simple

Function
Tilt

Could the input to gksudo gedit /etc/X11/xorg.conf be modified as under to get the highest resolution of 1920 x 1080 ? (as the monitor has a capacity to give this resolution).

Try:
gksudo gedit /etc/X11/xorg.conf
add this text:
Section "Device"
Identifier "Intel Corporation 82815 CGC [Chipset Graphics Controller]"
Driver "intel"
BusID "PCI:0:2:0"
EndSection
Section "Monitor"
Identifier "Samsung SyncMaster B2230"
Option "DPMS"
HorizSync 30-81
VertRefresh 56-75
EndSection
Section "Screen"
Identifier "Default Screen"
Device "Intel Corporation 82815 CGC [Chipset Graphics Controller]"
Monitor "Samsung SyncMaster B2230"
DefaultDepth 16
SubSection "Display"
Modes “1920 x 1080” "1024x768" "800x600" "640x480"
EndSubSection
EndSection
Section "ServerLayout"
Identifier "Default Layout"
Screen "Default Screen"
EndSection

PLEASE GUIDE ME WITH FULLY DETAILED INSTRUCTION AS I AM VERY NEW TO UBUNTU-10.10