[dephora@localhost ~]$ gtf 1280 1024 60

  # 1280x1024 @ 60.00 Hz (GTF) hsync: 63.60 kHz; pclk: 108.88 MHz
  Modeline "1280x1024_60.00"  108.88  1280 1360 1496 1712  1024 1025 1028 1060  -HSync +Vsync

[dephora@localhost ~]$ xrandr --newmode "1280x1024_60.00"  108.88  1280 1360 1496 1712  1024 1025 1028 1060  -HSync +Vsync
[dephora@localhost ~]$ xrandr --addmode VGA 1280x1024_60.00
[dephora@localhost ~]$ xrandr --output VGA --mode 1280x1024_60.00