Toshiba X205 - Manual (Page 207)

207 Hot Keys/TOSHIBA Cards
Hot key functions
5.375 x 8.375 ver 2.3
Display brightness
This TOSHIBA Card decreases or increases the screen
brightness.
Fn + This hot key decreases the screen brightness.
Fn + This hot key increases the screen brightness.
Selecting this Card or pressing either hot key displays the
following options:
(Sample Image) Display brightness
Move the slider or press the appropriate hot key repeatedly
to decrease or increase the display brightness.