Dell Inspiron 3800 System Reference Manual page 32

Using the Computer: Dell Inspiron 3800 System Reference
Adjusting the Brightness
To accommodate local lighting conditions or video output from the software you are using, you can use the key combinations shown in
NOTE: When you run the computer on battery power, set your computer's brightness control to the lowest setting that affords
comfortable viewing. You can conserve up to 10 percent of battery power by using the minimum brightness setting.
Table 7. Brightness Key Combinations and Their Functions
Key Combinations
<Fn> + down arrow
<Fn> + up arrow
<Fn> + right arrow
<Fn> + left arrow
NOTES: You cannot change contrast on an active-matrix (thin film transistor [TFT]) display. Contrast adjustments are only necessary
on passive matrix displays.
When using the integrated keyboard, you press <Fn> and the appropriate keys to perform certain functions. To 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.
Expanded Video Mode
When working in text mode, you can select the font used to display text. Press <Fn><F7> to toggle between a regular serif font and a serif font with extra
leading. Expanded video mode is useful if you are working in 800 x 600 resolution on a 14.1-inch extended graphics array (XGA) display.
NOTE: You may have trouble using the display fonts feature with MS-DOS® programs that use downloaded fonts.
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Function
Decreases brightness
Increases brightness
Decreases contrast
(has no effect on an active-matrix display)
Increases contrast
(has no effect on an active-matrix display)
Table 7.