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	noobmonkey	2010-04-29 , 10:49
	Posts: 3,203 \| Thanked: 1,391 times \| Joined on Nov 2009 @ Worthing, England	#14

Sorrrrrry - had a bit to drink last night... using a keyboard was not a sane idea!

The backlight under the keyboard is provided via 6 indepedent lights. Control and status information for those lights are found in /sys/class/leds/lp5523:kb*

oslo:~# ls -l /sys/class/leds/lp5523:kb1/
-rw-r--r-- 1 root root 4096 Dec 20 02:34 brightness
lrwxrwxrwx 1 root root 0 Dec 20 02:21 device -> ../../i2c-adapter/i2c-2/2-0032
-rw-rw-rw- 1 root root 4096 Dec 20 02:22 led_current
drwxr-xr-x 2 root root 0 Dec 20 02:21 power
lrwxrwxrwx 1 root root 0 Dec 20 02:21 subsystem -> ../../leds
-rw-r--r-- 1 root root 4096 Dec 20 02:21 trigger
-rw-r--r-- 1 root root 4096 Dec 20 02:21 uevent

The following loop sequentially sets the brightness of each of the 6 lights located under the keyboard to 255 (i.e. on) and then back to 0 (i.e. off). If you do it in the dark, you should see the position of each light.

backlights.sh

Code:

#! /bin/sh

for i in 1 2 3 4 5 6 ; do
    echo 255 > /sys/class/leds/lp5523:kb${i}/brightness ;
    sleep 1 ;
    echo   0 > /sys/class/leds/lp5523:kb${i}/brightness ;
done

Tadaaaaaaaaaaaaa

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