Dell Alienware M11x (Early 2010) - Manual (Page 33)

CHAPTER 2: GETTING TO KNOW YOUR LAPTOP
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F5 — Decrease Display Brightness
Press to decrease the brightness of the display.
F6 — Binary GFX
Press to enable or disable hybrid graphics mode.
The user can switch between the discrete and integrated graphic modes for
performance and power savings respectively.
F7 — Mute on/off
Press to enable or disable the mute function.
F8 — Decrease volume
Press to decrease the volume level.
F9 — Increase volume
Press to increase the volume level.
F10 — Rewind or Play previous track
Press to rewind or play previous track.