README.md

S8 restart itself on doze and standby

This issue is caused by a malfunction on android Power management on samsung S8

First some links how about it works, and last, how to resolve this issue

Power Management

This link explain how to android management the power
https://developer.android.com/about/versions/pie/power

Doze & standby

This link explain how to android work on doze and standby, its here on S8 restart itself
https://developer.android.com/training/monitoring-device-state/doze-standby

WakeLock

This link explain how wakelock works
https://developer.android.com/reference/android/os/PowerManager.WakeLock

Wakelock adb shell

This link explain adb shell dumpsys
https://developer.android.com/studio/command-line/dumpsys

Resolve Issue

To Resolve this issue is necessary an application with enable wakelock function for you S8 dont enter in doze mode
Because the issue occurred when S8 is on doze mode and enter in a maintenance window

How to

I used termux application on this tutorial, because termux have easy access to this feature for non dev IT dudes

Install termux on playstore
Open termux
In terminal type it termux-wake-lock

What termux-wake-lock do | developer section

#!/bin/sh

if [ $# != 0 ]; then
	echo 'usage: termux-wake-lock'
	echo 'Acquire the Termux wake lock to prevent the CPU from sleeping.'
	exit 1
fi

am startservice \
	--user 0 \wa
	-a com.termux.service_wake_lock \
	com.termux/com.termux.app.TermuxService \
	> /dev/null

After this, your S8 will scape doze mode when the display turn off and lock, and dont will restart itself anymore
This is necessary every time your phone reboot or shutdown, unless you have root privilegies, termux-boot or adb shell
There are other ways with adb shell like this https://www.xda-developers.com/stop-wakelocks-android-without-root/

Conclusion

Waiting for samsung resolve this issue, meanwhile ...

...

[ 07/2020 ] Samsung release another update, but the issue continue
[ 07/2021 ] still