Configure X display resolution

xrandr is a configuration utility for the X Window system; it can be used to set the size, orientation or reflection of the outputs for a screen.

Without any arguments, xrandr will print the current settings.

sbchand@localhost $ xrandr
Screen 0: minimum 320 x 200, current 1366 x 768, maximum 8192 x 8192
LVDS1 connected 1366x768+0+0 (normal left inverted right x axis y axis) 344mm x 193mm
   1366x768      60.00*+
   1360x768      59.80    59.96  
   1024x768      60.00  
   800x600       60.32    56.25  
   640x480       59.94  
VGA1 disconnected (normal left inverted right x axis y axis)
HDMI1 connected 1024x768+0+0 (normal left inverted right x axis y axis) 800mm x 450mm
   1920x1080     60.00    50.00    59.94    30.00    25.00    24.00    29.97    23.98  
   1920x1080i    60.00    50.00    59.94  
   1600x1200     60.00  
   1600x900      59.98  
   1280x1024     60.02  
   1280x960      60.00  
   1280x720      60.00    50.00    59.94  
   1440x576i     50.00  
   1024x768      60.00* 
   1440x480i     60.00    59.94  
   800x600       60.32  
   720x576       50.00  
   720x480       60.00    59.94  
   640x480       60.00    59.94  
DP1 disconnected (normal left inverted right x axis y axis)

In the above, example HDMI1 is connected using 1024x768 (note that the current setting is marked as *). Since HDMI1 supports 1920x1080, use the following command to set the resolution accordingly,

sbchand@localhost $ xrandr --output HDMI1 --mode 1920x1080