Turning off LEDs?

hanskr · March 9, 2021, 3:47pm

Hi, I’m using Android VIM3_Pie_V210128.

I can’t find out how to turn off the white led and the red led without going into the settings menu.

I want to do it using adb commands.
This worked, but only until reboot:
adb shell “echo 2 > /sys/class/redled/mode”
adb shell “echo none > /sys/class/leds/sys_led/trigger”
It seems Android just overwrites those settings on reboot.

The documentation on this page doesn’t help me: How To Control LEDs | Khadas Documentation

Frank · March 10, 2021, 12:55am

@hanskr This docs use for linux , about android , you can ask @Terry or @jasonl

jasonl · March 10, 2021, 2:03am

@hanskr yes ,when reboot ,it will set led mode again

hanskr · March 10, 2021, 7:44am

Oh, I see now. That doc is under Linux category, thanks.

So, is there a way to toggle the Android settings for led through ADB?

Terry · March 10, 2021, 12:32pm

Why did you want to save the led config with adb? You can refer to the source code

github.com

khadas/android_packages_apps_TvSettings/blob/khadas-vims-pie/Settings/src/com/android/tv/settings/device/led/LedFragment.java

/*
 * Copyright (C) 2012 The Android Open Source Project
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package com.android.tv.settings.device.led;

import android.app.ActivityManager;
import android.content.Context;

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hanskr · March 10, 2021, 1:28pm

Thank you, Terry!

The reason I want to change led config through adb is because we’re installing a lot of devices, and it takes a lot of time to connect a mouse and do it through the GUI.

This is the solution that worked:
adb shell setprop persist.sys.red.led.mode 2
adb shell setprop persist.sys.white.led.trigger 2

Then the leds will be off after reboot. Or if I want to turn the leds off immediately I can run these as well:
adb shell “echo 2 > /sys/class/redled/mode”
adb shell “echo off > /sys/class/leds/sys_led/trigger”