Need to adjust screen resolution for new monitor and facing difficulties.

[Luis Suzuki]

I purchased a Samsung monitor which advertises itself as having 1366*768 resolution but in fact it has 1360*768,when the Linux GUI appears we notice that some pixels are lacking on the right border,it is noticeable looking to some widgets,sliders etc.,I tried to put the following lines in /etc/gdm/Init/Default:
xrandr --newmode "1360x768_60.00"   84.75  1360 1432 1568 1776  768 771 781 798 -hsync +vsyncxrandr --addmode "1360x768_60.00"xrandr --output VGA1 --mode "1360x768_60.00"
when I do : #xrandr              I get at the final lines of output............1360x768_60.00 (0x111)   84.0MHz      h: width  1360 start 1432 end 1568 total 1776 skew    0 clock   47.3KHz      v: height  768 start  771 end  781 total  798           clock   59.3Hz
It seems recognized but in Ubuntu monitors Preferences this Modeline is not an option,so,it appearsthat in fact it is not recognized.Do I need to go through /usr/lib/X11/xorg.d/ and put there the new Modeline using the same formatting we use with xorg.conf?and what do I need to put there? just the line for the new Modeline or entire sections for device,screen,monitor as in xorg.conf.
 		 	   		  
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