xrandr

:~$ xrandr
Screen 0: minimum 8 x 8, current 1152 x 864, maximum 8192 x 8192
DVI-I-0 disconnected (normal left inverted right x axis y axis)
DVI-I-1 connected 1152x864+0+0 (normal left inverted right x axis y axis) 0mm x 0mm
   1024x768       60.0 +
   1360x768       60.0     59.8
   1152x864       60.0*
   800x600        72.2     60.3     56.2
   680x384       119.9    119.6
   640x480        59.9
   512x384       120.0
   400x300       144.4
   320x240       120.1
DVI-I-2 disconnected (normal left inverted right x axis y axis)
DVI-I-3 disconnected (normal left inverted right x axis y axis)
  1920x1080_59.90 (0x283) 1581.9MHz
        h: width  8192 start 8968 end 9896 total 11600 skew    0 clock  136.4KHz
        v: height 8192 start 8193 end 8196 total 8472           clock   16.1Hz
  8192x8192_59.90 (0x284) 1581.9MHz
        h: width  8192 start 8968 end 9896 total 11600 skew    0 clock  136.4KHz
        v: height 8192 start 8193 end 8196 total 8472           clock   16.1Hz
  1024x768_60.0 (0x288)  172.2MHz
        h: width  1920 start 2040 end 2248 total 2576 skew    0 clock   66.9KHz
        v: height 1080 start 1081 end 1084 total 1118           clock   59.8Hz
  8192x8192_60.0 (0x28b)  172.2MHz
        h: width  1920 start 2040 end 2248 total 2576 skew    0 clock   66.9KHz
        v: height 1080 start 1081 end 1084 total 1118           clock   59.8Hz



Image by "Screens" app : http://i1222.photobucket.com/albums/dd487/learn1000/Sigmatauiotagammamuiota3CC0tauupsilonpiomicronalphapi3CC02014-09-26115517.png