simran@simran-desktop:~$ xrandr
Screen 0: minimum 8 x 8, current 1440 x 900, maximum 32767 x 32767
VGA1 connected primary 1440x900+0+0 (normal left inverted right x axis y axis) 477mm x 268mm
1920x1080 60.00 +
1680x1050 59.95
1280x1024 75.02 60.02
1440x900 59.89*
1280x960 60.00
1024x768 75.08 70.07 60.00
832x624 74.55
800x600 72.19 75.00 60.32 56.25
640x480 75.00 72.81 66.67 60.00
720x400 70.08
VIRTUAL1 disconnected (normal left inverted right x axis y axis)
simran@simran-desktop:~$ cvt 1366 768
# 1368x768 59.88 Hz (CVT) hsync: 47.79 kHz; pclk: 85.25 MHz
Modeline "1368x768_60.00" 85.25 1368 1440 1576 1784 768 771 781 798 -hsync +vsync
simran@simran-desktop:~$ xrandr --newmode ^C
simran@simran-desktop:~$ xrandr --newmode "1368x768_60.00" 85.25 1368 1440 1576 1784 768 771 781 798 -hsync +vsync
simran@simran-desktop:~$ xrandr --addmode VGA1 "1368x768_60.00"
simran@simran-desktop:~$ xrandr -q
Screen 0: minimum 8 x 8, current 1440 x 900, maximum 32767 x 32767
VGA1 connected primary 1440x900+0+0 (normal left inverted right x axis y axis) 477mm x 268mm
1920x1080 60.00 +
1680x1050 59.95
1280x1024 75.02 60.02
1440x900 59.89*
1280x960 60.00
1024x768 75.08 70.07 60.00
832x624 74.55
800x600 72.19 75.00 60.32 56.25
640x480 75.00 72.81 66.67 60.00
720x400 70.08
1368x768_60.00 59.88
VIRTUAL1 disconnected (normal left inverted right x axis y axis)
simran@simran-desktop:~$ xrandr --output VGA1 --mode 1368x768_60.00