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[Q] Power save issue

I've noticed that every time the phone enters power safe mode, there is a problem after that.
Next morning after the phone is charged, ALL settings regarding power safe mode are still in effect (wireless is disabled, brightness is at the lowest, etc)
In my opinion, once the phone is fully charged , those power safe settings should be reverted to their original state, BEFORE they were activated.
Because they do NOT revert, and you have to manually put them back the way you want (and how they were before power safe is activated) is a poor design.
Is there a solution to this problem, so they automatically revert once power safe is deactivated?

Solve problems with Safe mode

" Unfortunately, the process com.xxx.phone has stopped" Normally this error message is due to conflicts arose by an application. Sometime the the phone becomes completely unusable.
Solution: Boot to Safe Mode and Uninstall the App.
How to Boot to safe mode:
1. Switch phone off
2. Hold the power button until google logo (first logo) appears, then hold down volume down until phone has finished booting.
3. You will see the safe mode Notification in the bottom left corner of the screen.
4. Open Playstore and uninstall the conflicting application then reboot.
Restore your Widgets and your phone should be trouble free.
NOTE: None of your data will be Lost:good:

*Solved* - System UI Stopped working [System ui tuner][No ADB/root/recovery]

My god the world needs to know this.
So below describes my last predicament. Basically was stuck at black screen on boot with system ui crash and had stupidly for no good reason blocked myself from getting adb
Phone was technically powered on and connected to my wifi.
logged into findmymobile.samsung.com and from there as the device was powered on and running but not usable i was able to find device and start a full wipe. With the wipe it got rid of the max power mode and uninstalled the system ui tuner allowing me to resetup the device like new.
Down side is as much as google handle 70% of a phone change over i still had to reset my watches and re do the fingerprints
So, galaxy S8+
Never been a fan of Samsung but a mate sold me his old s8+ for pretty cheap yesterday, today i installed system ui tuner and allowed it via adb, then as the battery was low i switched to "charge only" mode
Today i got a notification saying something about battery optimisation (Max Battery Saver Mode) and i was all about it so i clicked yes and whatever without reading it expecting it to clear catchs and kill some background apps. anyways a few seconds later it rebooted itself and popped up with the message "system ui stopped working". Literally the only things that can happen is when i click the bixby button it says "cannot use bixby while maximum power saving mode is on". and if i hold the power button i get the shutdown and reset icons but when clicking them nothing happens.
I have tried safe mode, still get the same result with ui stopped working
Pressing and holding the power + volume up + bixby button gets me to a screen with some info up to continue and down to cancel, once pressing up nothing happens apart from a screen saying downloading (nothing happens tho)
Not sure what to do

Thanks for the details.

Help sm-g955u screen wont light up after it wakes

First of all I appreciate any and all help on this matter. My problem is simple yet the solution escapes me. My phone starts up fine works fine and there are no problems....until I wake it up from sleep. The phone itself comes on and I can tell that the screen wakes up, but there's no blacklight, just a very dark home screen. So far the only annoying thing i have to do is reset it and it works fine again....until it goes back to sleep. I guess my question is, is this an issue that can be resolved (software). Or is it unfixable without screen replacement (hardware).

You need to test a few things beforehand.
Does it only produce this issue if the screen times out, or by manually pressing the power key to turn the screen off, or both?
Does the screen appear dim when you wake it up via the power button, hard pressing the home button to wake, or using your fingerprint scanner to turn on and unlock your device or a combination of those listed?
I would try safe mode.
You can boot into safe mode by following the below instructions:
1. Power off your device in question
2. Press and hold the power button to turn on the phone
3. When the Samsung logo disappears, release the power key and press and hold the volume down key
4. Continue holding the volume down key until the phone has finished restarting
5. You should now be in safe mode and can verify by looking in the bottom left of the screen for text that states you're in safe mode
After you have successfully booted into safe mode you need to allow your screen to turn off manually, automatically, or both(whichever results in a dim screen when normally booted up) when testing the below steps.
Turn your screen on via the power button and see if the issue remains.
Turn your screen on via the hard press to wake home button (not sure if this is available from safe mode, but worth a try) and see if the issue remains.
Turn your screen on via the fingerprint sensor (not sure if this works from safe mode either) and see if the issue remains.
If all successfully turn on the screen with normal brightness then I would say it's more than likely NOT a hardware issue. If one or the other does not produce normal screen brightness then it's more than likely hardware. If all result in a dim screen then it could be either hardware or corrupt software.

Outbreak444 said:
You need to test a few things beforehand.
Does it only produce this issue if the screen times out, or by manually pressing the power key to turn the screen off, or both?
Does the screen appear dim when you wake it up via the power button, hard pressing the home button to wake, or using your fingerprint scanner to turn on and unlock your device or a combination of those listed?
I would try safe mode.
You can boot into safe mode by following the below instructions:
1. Power off your device in question
2. Press and hold the power button to turn on the phone
3. When the Samsung logo disappears, release the power key and press and hold the volume down key
4. Continue holding the volume down key until the phone has finished restarting
5. You should now be in safe mode and can verify by looking in the bottom left of the screen for text that states you're in safe mode
After you have successfully booted into safe mode you need to allow your screen to turn off manually, automatically, or both(whichever results in a dim screen when normally booted up) when testing the below steps.
Turn your screen on via the power button and see if the issue remains.
Turn your screen on via the hard press to wake home button (not sure if this is available from safe mode, but worth a try) and see if the issue remains.
Turn your screen on via the fingerprint sensor (not sure if this works from safe mode either) and see if the issue remains.
If all successfully turn on the screen with normal brightness then I would say it's more than likely NOT a hardware issue. If one or the other does not produce normal screen brightness then it's more than likely hardware. If all result in a dim screen then it could be either hardware or corrupt software.
Click to expand...
Click to collapse
The problem is reproduced irregardless of the method used to put the phone to sleep. I will give it a try in safe mode tonight. I also wanted to add that randomly the screen will power on normally but never on the first wake attempt.

[email protected] said:
The problem is reproduced irregardless of the method used to put the phone to sleep. I will give it a try in safe mode tonight. I also wanted to add that randomly the screen will power on normally but never on the first wake attempt.
Click to expand...
Click to collapse
Let me know the results of safe mode once you have tried that.

Outbreak444 said:
Let me know the results of safe mode once you have tried that.
Click to expand...
Click to collapse
It still reproduces the problem in safe mode. i tried to wake it with the power button, home buttonand the fingerprint sensor... also under forced sleep mode and letting it time out itself.

[email protected] said:
It still reproduces the problem in safe mode. i tried to wake it with the power button, home buttonand the fingerprint sensor... also under forced sleep mode and letting it time out itself.
Click to expand...
Click to collapse
At this point, it's more than likely hardware but because it's intermittent you could try using Odin to flash firmware. I would advise you to look to the appropriate forum for instructions. And as always, if you have the ability then backup the data you wish to keep, do it prior to flashing the software.

Outbreak444 said:
At this point, it's more than likely hardware but because it's intermittent you could try using Odin to flash firmware. I would advise you to look to the appropriate forum for instructions. And as always, if you have the ability then backup the data you wish to keep, do it prior to flashing the software.
Click to expand...
Click to collapse
Well I figured it out. there was damage to the sensor that determines how light or dark it is. If I cover the top part of the screen with my finger then wake the device, it comes on every time. I hope this helps other people out in the future.

[email protected] said:
Well I figured it out. there was damage to the sensor that determines how light or dark it is. If I cover the top part of the screen with my finger then wake the device, it comes on every time. I hope this helps other people out in the future.
Click to expand...
Click to collapse
Try this then:
Under display settings turn off "Block accidental touches"
See if that results in not having to block your sensor every time.
**Edit**
By the way, glad you figured it out.

Blank Screen Bootloop?

Hi Everyone,
Phone decided to randomly turn off (at around 80% charge) and now won't boot. Have tried all the basic TS guides.
have tried:
-Charging - no on-screen displays
-Holding power button for various intervals
-Button combinations (Power + vol up....etc)
Connecting to PC gives me an indication that it has detected a USB connection, then consistently after ~40s I get the disconnect notification sound. Then off for 20s and the the cycle repeats.
I'm assuming it is stuck in bootloop for some reason but still nothing from the screen.
Phone hasn't been dropped, rooted, is running stock ROM etc...
any ideas?

Assuming the bootloop isn't caused by hardware failure then you can try forcing your phone into its Recovery mode by holding down the power button and volume down button simultaneously. From here, you may be able to roll your phone back or restore a previous backup. However, this often results in data loss, which isn't ideal, so you might have to weigh up your options.
If this doesn't work, you'll need to enter your smartphone's Safe Mode. When your phone is booting, and you see the manufacturer's name appear, press and hold the volume down button to put your device into Safe Mode. Here, you can follow prompts to hopefully remove whatever program, app, or software updates forced your phone into a bootloop.

xXx yYy said:
Assuming the bootloop isn't caused by hardware failure then you can try forcing your phone into its Recovery mode by holding down the power button and volume down button simultaneously. From here, you may be able to roll your phone back or restore a previous backup. However, this often results in data loss, which isn't ideal, so you might have to weigh up your options.
If this doesn't work, you'll need to enter your smartphone's Safe Mode. When your phone is booting, and you see the manufacturer's name appear, press and hold the volume down button to put your device into Safe Mode. Here, you can follow prompts to hopefully remove whatever program, app, or software updates forced your phone into a bootloop.
Click to expand...
Click to collapse
It won't boot at all, the screen doesn't turn on. But surely something like this doesn't just randomly fail

My recommendation: take phone to authorized service center and let them try to fix it.