Latitude E5440 Display Rotation is not working.

If the Rotation lock is set to on and Orientation is set to  Landscape  then the display is in landscape mode. If the Rotation lock is set off and the screen is rotated clockwise 90 degrees  then the display is upside down. If the screen is rotated clockwise 90 degrees then the display does not change.. if the screen is rotated 90 degree then the display is upside down. If the screen is rotated 90 then the display does not move. 

Therefore if the laptop is in normal or opposite then the display is rotated 90 degrees. It the laptop is turned sideways then the display is upside down.