BACKLIGHT n [,DEFAULT]
NON VGA OR HDMI VERSIONS
Sets the display backlight, valid values are 0 to 100. If DEFAULT is specified then the firmware will automatically set the backlight to that level on power- up. This is particularly useful for battery operation where reducing the backlight level can significantly increase battery life.
BACKLIGHT n [,FreqInHz]
NON VGA OR HDMI VERSIONS
Some circuits are too slow to use the default backlight PWM frequency which is chosen to avoid interference with audio. In which case a user frequency can be specified.
This is a temporary option and will need setting on reboot.