Root Changes in /sys file

[str8stryk3r]

So I'm up late and messing around. Basically what I am trying to do is change the time the four keys on the bottom of the phone stay on for. I navigated to /sys/devices/keypad-backlight/backlight. In there there is a file named "keypad_bl_time" Open that in text and it says "Current backlight time : 3 : seconds. Now if I change that to any other number and save it, open it back up and the value I put in changes to "-104859392385" and the backlights stay on for as long as the screen is on. Reboot and everything goes back to default.

So...question is. Can you make changes to the /sys file like that or are there other steps you have to take? Or am I in the wrong place trying to make changes to begin with? I'm only messin around to begin with so this post isn't asking about actually changing the lights per say. Thanks

 

[karandpr]

do this

cat /sys/devices/keypad-backlight/backlight/keypad_bl_time

You will get a value .
change the desired value using

echo desired_value /sys/devices/keypad-backlight/backlight/keypad_bl_time

example:
my keyboard backlight is annoying and is always on when LCD is on
I used

cat /sys..../brightness

255
is the out put
I change the value to 0 to disable it using

echo 0 /sys..../brightness

I am not well verse with Tasker but you can control many aspects of /sys folders an uevents with help of tasker profiles

Hope this helps

 

[Bloodawn]

you can add this to your build.prop to keep the button lights on when the screen is on

ro.mot.buttonlight.timeout=0

 

[str8stryk3r]

Alright well I actually tried to do both of the fore mentioned instructions and neither one of them stuck. When I tried the build.prop one it made a build.prop.bak I checked to make sure everything was correct, saved it and rebooted. Everything was still in there but the lights still went off after 3 seconds. And trying to change the value using the adb command didn't do anything either. I did the check, changed echo 5 to see if it would stay on for 5 seconds. Rebooted, no change. Went back in and checked the value again and it was set back to default 3 seconds.

So do I need to change any permissions or anything? And will using Qatb as my adb method work or should I get a terminal app on the device?

 

[johnny424]

you can add this to your build.prop to keep the button lights on when the screen is on

ro.mot.buttonlight.timeout=0

i tried this bp edit out a while back...but had no luck