BackLight

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Revision as of 19:53, 13 May 2007 by JulienB (Talk | contribs) (Bettter config desc)

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Installation

$ make linux-menuconfig
  • Activate Lowlevel Backlight control in Device Drivers ---> Graphics support ---> Backlight & LCD device support
  • 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
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