[dada@Mithril ~]$ cvt 2560 1440 144
# 2560x1440 143.91 Hz (CVT) hsync: 225.66 kHz; pclk: 808.75 MHz
Modeline "2560x1440_144.00"  808.75  2560 2792 3072 3584  1440 1443 1448 1568 -hsync +vsync
[dada@Mithril ~]$ xrandr --newmode "2560x1440_144.00"  808.75  2560 2792 3072 3584  1440 1443 1448 1568 -hsync +vsync
[dada@Mithril ~]$ xrandr
Screen 0: minimum 320 x 200, current 2560 x 1440, maximum 16384 x 16384
DisplayPort-0 connected primary 2560x1440+0+0 (normal left inverted right x axis y axis) 597mm x 336mm
   2560x1440    143.86 + 119.88    59.95*
   1920x1080     60.00    60.00    50.00    59.94
   1280x1024     75.02    60.02
   1440x900      59.89
   1152x864      75.00
   1280x720      60.00    50.00    59.94
   1440x576      50.00
   1024x768      75.08    70.07    60.00
   1440x480      60.00    59.94
   832x624       74.55
   800x600       72.19    75.00    60.32    56.25
   720x576       50.00
   640x480       75.00    66.67    60.00    59.94
   720x400       70.08
HDMI-0 disconnected (normal left inverted right x axis y axis)
DVI-0 disconnected (normal left inverted right x axis y axis)
DVI-1 disconnected (normal left inverted right x axis y axis)
  2560x1440_144.00 (0x4e5) 808.750MHz
        h: width  2560 start 2792 end 3072 total 3584 skew    0 clock 225.66KHz
        v: height 1440 start 1443 end 1448 total 1568           clock 143.91Hz
[dada@Mithril ~]$ xrandr --addmode DisplayPort-0 2560x1440_144.00
[dada@Mithril ~]$ xrandr --output DisplayPort-0 --mode 2560x1440_144.00