xrandr
Screen 0: minimum 320 x 200, current 3840 x 1024, maximum 8192 x 8192
HDMI-0 disconnected (normal left inverted right x axis y axis)
VGA-1 connected 1280x1024+2560+0 (normal left inverted right x axis y axis) 337mm x 270mm
   1280x1024      60.0 +   75.0*
   1152x864       75.0
   1024x768       75.1     70.1     60.0
   832x624        74.6
   800x600        72.2     75.0     60.3     56.2
   640x480        75.0     72.8     66.7     60.0
   720x400        70.1
DVI-0 connected primary 1280x1024+1280+0 (normal left inverted right x axis y axis) 338mm x 270mm
   1280x1024      60.0*+
   1280x960       60.0
   1024x768       60.0
   800x600        60.3
   640x480        60.0
   720x400        70.1
VGA-1-0 connected 1280x1024+0+0 0mm x 0mm
   1280x1024_60.00   59.9*
   1024x768       60.0
   800x600        60.3     56.2
   848x480        60.0
   640x480        59.9
DVI-1-0 disconnected
  1024x768 (0x55)   65.0MHz
        h: width  1024 start 1048 end 1184 total 1344 skew    0 clock   48.4KHz
        v: height  768 start  771 end  777 total  806           clock   60.0Hz
  800x600 (0x56)   40.0MHz
        h: width   800 start  840 end  968 total 1056 skew    0 clock   37.9KHz
        v: height  600 start  601 end  605 total  628           clock   60.3Hz
  800x600 (0x57)   36.0MHz
        h: width   800 start  824 end  896 total 1024 skew    0 clock   35.2KHz
        v: height  600 start  601 end  603 total  625           clock   56.2Hz