Dell Inspiron 3800 System Reference Manual page 23

Using the Computer: Dell Inspiron 3800 System Reference
<Fn><F8> Switches the video image to the next display in the following sequence: the display, an external monitor, or both the display and the
monitor simultaneously. This key combination may not be supported under certain conditions.
<Fn><d>
Turns off the display. This key combination may not be supported under certain conditions.
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The extended desktop feature (the ability to simultaneously display video of the same content and resolution on both the computer display
screen and the external monitor) is not supported if the computer is booted to MS-DOS®, using a full-screen MS-DOS session under a
Microsoft Windows operating system, or the ATI Mobility M1 video driver is not loaded. This limitation may also be noted in operating
systems other than Microsoft Windows.
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Certain key combinations may not function with the Advanced Configuration and Power Interface (ACPI) or may require configuration with
the Power Management Properties window in the Control Panel. See
Power Conservation Key Combinations
NOTE: When using the integrated keyboard, you press <Fn> and the appropriate keys to perform certain functions (see
perform such functions on an external keyboard, you press <Scroll Lock> and the appropriate keys. You must be sure that the
External Hot Key option is enabled in the System Setup program.
Use the key combinations in Table 3 to activate or turn off the computer's power conservation features.
Table 3. Power Conservation Key Combinations
Key Combinations
<Fn><d>
<Fn><h>
<Fn><Esc>
<Fn><a> or
<Fn><q> on French keyboards
* This key combination does not function with ACPI if the settings have not been configured with the Power Management Properties window in the Control
Panel. See "Power Conservation."
Processing Speed Key Combinations
NOTE: When using the integrated keyboard, you press <Fn> and the appropriate keys to perform certain functions (see
perform such functions on an external keyboard, you press <Scroll Lock> and the appropriate keys. You must be sure that the
External Hot Key option is enabled in the System Setup program.
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"Power
Function
Turns off the display*
Turns off the hard-disk drive*
Activates sleep or standby mode
Activates save-to-disk suspend (S2D) mode or hibernate mode(ACPI only)*
Conservation."
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2
Table 3). To
Table 4). To