xrandr
Screen 0: minimum 320 x 200, current 1366 x 768, maximum 32767 x 32767
LVDS1 connected 1366x768+0+0 (normal left inverted right x axis y axis) 309mm x 173mm
   1366x768       60.1*+   40.0
   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)
LVDS-1 connected (normal left inverted right x axis y axis)
   1366x768       60.1 +
   1280x720       59.9
   1152x768       59.8
   1024x768       59.9
   800x600        59.9
   848x480        59.7
   720x480        59.7
   640x480        59.4
HDMI-0 disconnected (normal left inverted right x axis y axis)
VGA-1 disconnected (normal left inverted right x axis y axis)
  1366x768 (0x47)   76.3MHz
        h: width  1366 start 1404 end 1426 total 1592 skew    0 clock   47.9KHz
        v: height  768 start  771 end  777 total  798           clock   60.1Hz