BackLight

Installation

$ make linux-menuconfig

Activate i.MXL backLight driver in Device Drivers -> Armadeus specific drivers -> Support for specific Armadeus drivers If built in kernel, reflash your kernel image, if selected as module either reflash your rootfs or copy backlight.ko, imx_bl.ko and .../lib/modules/2.6.18.1/modules.dep to your target. Then

$ modprobe imx_bl

Usage

All backlight controls are done through the /sys interface:

# ls /sys/class/backlight/imxl-bl/

actual_brightness  max_brightness     subsystem
brightness         power              uevent

Consult the actual brightness:

# cat /sys/class/backlight/imxl-bl/actual_brightness

Consult the max allowed brightness:

# cat /sys/class/backlight/imxl-bl/max_brightness

Change brightness:

# echo 100 > /sys/class/backlight/imxl-bl/brightness