Incluindo resolução não detectada

$ sudo cvt 1280 1024 60

# 1280x1024 59.89 Hz (CVT 1.31M4) hsync: 63.67 kHz; pclk: 109.00 MHz

Modeline "1280x1024_60.00"  109.00  1280 1368 1496 1712  1024 1027 1034 1063 -hsync +vsync

$ sudo xrandr --newmode "1280x1024_60.00"  109.00  1280 1368 1496 1712  1024 1027 1034 1063 -hsync +vsync

$ xrandr

Screen 0: minimum 320 x 200, current 2390 x 768, maximum 32767 x 32767

LVDS1 connected primary 1366x768+0+0 (normal left inverted right x axis y axis) 293mm x 165mm

   1366x768       60.0*+

   1360x768       59.8     60.0  

   1024x768       60.0  

   800x600        60.3     56.2  

   640x480        59.9  

VGA1 connected 1024x768+1366+0 (normal left inverted right x axis y axis) 0mm x 0mm

   1024x768       60.0* 

   800x600        60.3     56.2  

   848x480        60.0  

   640x480        59.9  

HDMI1 disconnected (normal left inverted right x axis y axis)

DP1 disconnected (normal left inverted right x axis y axis)

VIRTUAL1 disconnected (normal left inverted right x axis y axis)

$ sudo xrandr --addmode VGA1 1280x1024_60.00