See also /sys/class/backlight//ambient_light_level and /sys/class/backlight//ambient_light_zone. What: /sys/class/backlight//_max What: /sys/class/backlight//l1_daylight_max What: /sys/class/backlight//l2_bright_max What: /sys/class/backlight//l3_office_max What: /sys/class/backlight//l4_indoor_max What: /sys/class/backlight//l5_dark_max Date: May 2011 KernelVersion: 3.0 Contact: device-drivers-devel@blackfin.uclinux.org Description: Control the maximum brightness for on this . Values are between 0 and 127. This file will also show the brightness level stored for this . What: /sys/class/backlight//_dim What: /sys/class/backlight//l2_bright_dim What: /sys/class/backlight//l3_office_dim What: /sys/class/backlight//l4_indoor_dim What: /sys/class/backlight//l5_dark_dim Date: May 2011 KernelVersion: 3.0 Contact: device-drivers-devel@blackfin.uclinux.org Description: Control the dim brightness for on this . Values are between 0 and 127, typically set to 0. Full off when the backlight is disabled. This file will also show the dim brightness level stored for this .