Difference between revisions of "BackLight"

Revision as of 19:53, 13 May 2007

$ 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

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

@@ Line 1: / Line 1: @@
 ==Installation==
   $ make linux-menuconfig
-Activate '''i.MXL backLight driver''' in '''Device Drivers -> Armadeus specific drivers -> Support for specific Armadeus drivers'''
+* Activate '''Lowlevel Backlight control''' in '''Device Drivers ---> Graphics support  ---> Backlight & LCD device support'''
-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
+* 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