Dell Alienware M17x R3 (Early 2011) - Manual (Page 40)

CHAPTER 2: GETTING TO KNOW YOUR LAPTOP
38
F11 – AlienFX on/off
Press <Fn><F11> to enable or disable the AlienFX illumination.
F12 – Touch Pad on/off
Press <Fn><F12> to enable or disable the touch pad function and the illumination
around the touch pad. When the touch pad function is switched off, the touch pad
can still work temporarily for three to five seconds while the computer reboots into
the Windows operating system, or resumes from standby or hibernate mode.