xrandr --current
Screen 0: minimum 320 x 200, current 2646 x 768, maximum 32767 x 32767
LVDS1 connected 1366x768+0+0 (normal left inverted right x axis y axis) 344mm x 193mm
   1366x768       60.0*+
   1360x768       59.8     60.0
   1024x768       60.0
   800x600        60.3     56.2
   640x480        59.9
VGA1 disconnected (normal left inverted right x axis y axis)
HDMI1 connected 1280x768+1366+0 (normal left inverted right x axis y axis) 708mm x 398mm
   1280x768       60.0*+
   1920x1080i     60.1     50.0     60.0
   1280x720       60.0     50.0     59.9
   1024x768       75.1     60.0
   1152x648       75.0
   1024x576       85.1
   832x624        74.6
   800x600        75.0     60.3
   720x576        50.0
   800x450        85.0
   720x480        60.0     59.9
   640x480        75.0     60.0     60.0     59.9
   640x360        85.0
DP1 disconnected (normal left inverted right x axis y axis)
VIRTUAL1 disconnected (normal left inverted right x axis y axis)