Owner's Manual
Page 45
...the Video Image From Your Computer Display to your portable computer, not monitors or projectors that you attach to a Projector When you start the computer with an external device attached (such as an external monitor or projector) and turned on, the image may appear on either the computer display or...-arrow key to decrease brightness on the integrated display only (not on an external monitor). Using the Display Adjusting Brightness When a Dell™ computer is connected to an external monitor and you try to switch the video image between the display only, the external device only, or the...
...the Video Image From Your Computer Display to your portable computer, not monitors or projectors that you attach to a Projector When you start the computer with an external device attached (such as an external monitor or projector) and turned on, the image may appear on either the computer display or...-arrow key to decrease brightness on the integrated display only (not on an external monitor). Using the Display Adjusting Brightness When a Dell™ computer is connected to an external monitor and you try to switch the video image between the display only, the external device only, or the...