Toshiba VIRTUALTECH C6609-1201M1 - Manual (Page 184)

184 Hot Keys
Display brightness
5.375 x 8.375 ver 2.3.2
Display brightness
Keyboard hot keys
Fn + This hot key decreases the screen brightness.
Fn + This hot key increases the screen brightness.
Fn + This hot key turns the cursor control overlay on
and off.
Fn + This hot key turns the numeric overlay on and off.
Fn + This hot key turns the scroll lock feature on and
off.