However, if the function keys F1-F12 are needed for specific software applications, multi-media functionality can be disabled
by pressing Fn + Esc. Subsequently, multi-media control can be invoked by pressing Fn and the respective function key. For
example, mute audio by pressing Fn + F1.
NOTE: You can also define the primary behavior of the function keys (F1–F12) by changing Function Key Behavior in
BIOS setup program.
Table 13. List of keyboard shortcuts
Function key Primary behavior
F1 Mute audio
F2 Decrease volume
F3 Increase volume
F4 Mute mic
F5 Click keyboard backlight (optional).
NOTE: Non-backlight keyboards have F5 function key without the
backlight icon and do not support toggle keyboard backlight function.
NOTE: Toggle to cycle the keyboard backlight status through off, low-
backlight, and high-backlight
F6 Decrease brightness
F7 Increase brightness
F8 Switch to external display
F10 Print screen
F11 Home
F12 End
The Fn key is also used with selected keys on the keyboard to invoke other secondary functions.
Table 14.
Secondary behavior
Function key Secondary behavior
Fn + F1 Operating system and application specific F1 behavior
Fn + F2 Operating system and application specific F2 behavior
Fn + F3 Operating system and application specific F3 behavior
Fn + F4 Operating system and application specific F4 behavior
Fn + F5 Operating system and application specific F5 behavior
Fn + F6 Operating system and application specific F6 behavior
Fn + F7 Operating system and application specific F7 behavior
Fn + F8 Operating system and application specific F8 behavior
Fn + F10 Operating system and application specific F10 behavior
Fn + F11 Operating system and application specific F11 behavior
Fn + F12 Operating system and application specific F12 behavior
Fn + PrtScr Turn off/on wireless
Fn + B Pause
Fn + Ctrl + B Break
Fn + Insert Sleep
Fn + S Toggle scroll lock
16 Specifications of Latitude 3550
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