The keyboard backlight can be enabled and disabled via the key combination "FN + Z" within the operating system.
"FN + Z" toggles the mode of the keyboard backlight between Timer, On, and Off.
To set up the brightness, click Start -> TOSHIBA -> TOSHIBA Settings. Click Keyboard tab, and select a level under Keyboard Backlight Brightness Control.
To set up the timer, launch the BIOS setup utility, select PowerManagement -> Keyboard Backlight Control Mode, and select TIMER. Adjust the timer under Backlight Lighting Time.
This function is supported with some models.