Dell Inspiron 1521 (Mid 2007) - Manual (Page 39)

Using the Display
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Using the Display
Adjusting Brightness
When a Dell™ computer is running on battery power, you can conserve power
by setting the display brightness to the lowest comfortable level.
• Press and the up-arrow key to increase brightness on the integrated
display only (not on an external monitor).
• Press and the down-arrow key to decrease brightness on the
integrated display only (not on an external monitor).
NOTE:
Brightness key combinations only affect the display on your portable
computer, not monitors or projectors that you attach to your portable computer or
docking device. If your computer is connected to an external monitor and you try to
change the brightness level, the Brightness Meter may appear, but the brightness
level on the external device does not change.
Switching the Video Image From Your Computer
Display 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 the external device.
Press to switch the video image between the display only, the
external device only, or the display and the external device simultaneously.
Setting Display Resolution and Refresh Rate
NOTE:
If you change the display resolution from the current settings, the image
may appear blurry or text may be hard to read if you change the resolution to one
not supported by your computer and display. Before you change any of the display
settings, make a note of the current settings so you can change back to the
previous settings if needed.