myscreenp

root@monica:/home/monica# cvt 1360 768 59.8 | grep -i modeline
Modeline "1360x768_59.80"   84.50  1360 1432 1568 1776  768 771 781 798 -hsync +vsync
root@monica:/home/monica# xrandr --newmode "1360x768_59.80" 84.50 1360 1432 1568 1776 768 771 781 798 -hsync +vsync
root@monica:/home/monica# xrandr --addmode LVDS1 1360x768_59.80
X Error of failed request:  BadMatch (invalid parameter attributes)
  Major opcode of failed request:  149 (RANDR)
  Minor opcode of failed request:  18 (RRAddOutputMode)
  Serial number of failed request:  22
  Current serial number in output stream:  23
root@monica:/home/monica# xrandr --output LVDS1 --mode 1360x768_59.80
xrandr: cannot find mode 1360x768_59.80