Fingerprint Scanner Issue - T-Mobile Samsung Galaxy S8 Questions & Answers

Has anyone noticed a issue with the fingerprint scanner just not working? I have had it twice. I have a friend on a S8+ with the same issue. It requires a restart to fix it.

Yeah, it happened to mine when I went to the gym. My phone was a little wet from sweat and it would not work. A quick reboot fixed it. A little annoying, something that will hopefully get squashed.

I had this issue for a few days, but I don't think I've had issues after I updated. Since I updated, when I thought it wasn't going to work, I'd either slightly change my finger position or hold my finger on the sensor longer, and it would unlock. It's just a crap location lol.

I had the same issue. I did some research and found that dialing *#0*#, clicking on sensor, then scrolling to the bottom under FingerPrint test and clicking normal scan seems to have helped. I haven't had the issue since and it's been a few days.

I had to turn the swipe down for notifications w/ fingerprint to get it to work again.

Happened yesterday, after I touched it with a wet finger. Restart fixed it.

I am having the same issue
Sent from my SM-G950U using Tapatalk

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Black screen after call - growing tired of this phone

Does anyone else have this issue? It's really driving me crazy to the point where I feel like ditching the Nexus 6. It's not even every call, but it is enough to annoy me. Pull the phone away from my head and the screen wont wake up. All I can do is long hold power to force a reset. It's really annoying. I've tried the proximity fix for 5.1 but it still happens. I can't set "power to end call" because also sometimes the phone doesn't wake the screen when there is an incoming call so I have to press power to wake the screen to see who it is.
Does anyone have any idea how to get around this other than the two solutions above? This has happened on both my devices (Original and RMA) and I just can't take it any more.
I sounds like a faulty proximity sensor. And I've observed intermittent behavior like this on previous phones (but not my N6). You can test this with a number of apps. I've used "Sensor Box for Android", but there are several more. Prox sensor is located near the top LH corner. With the app open and on prox sensor, passing your hand over it should register on the app.
You are so active on this forum that I won't even ask about a screen protector....
The proximity sensor seems to work fine under all tests that I have done. I actually use Tasker to utilise the proximity sensor to set ringer volume based on whether it is activated or not (eg in my pocket, proximity sensor CLOSE, set ringer high).
Its not every call either and multiple Nexus 6 devices have had this issue for me too. Proximity sensor works in every test
That's weird. I've had no issues at all. I assume you have the issue on the stock ROM too.....
I suppose I'll have to test though I don't really want to run stock.
What about disabling Tasker and trying it out.
Happens with or without tasker. It's pretty much always done it since 5.1
There are known issues with the prox being flaky on this device. I just need to find a way to overcome this.
Remember, we need to separate problem solving from the idea of how we want our phone to look and perform. Once you've identified the root cause, you can then decide what steps you want to take to solve it.
*Sigh* Yes I know. But it's so intermittent I won't know if it solves it for a looooong time. It would be quicker to return to stock, sell it and buy something else
I've literally never ran stock on the nexus 6.
Like Camera indicated, I'd try removing the screen protector if you have one and see if it's better.
It's not a protector issue.
Let's assume I've done all the obvious things except flash stock
Edit. I'm going to try and use power button ends call. Just to see of its an active call that causes it.
Hopefully it will happen when I can take a log cat but inise the phone very rarely.
Try this app in the Playstore.
https://play.google.com/store/apps/details?id=com.vorlan.screenoncall.free
I had a similar issue where the screen would time out while I was on a call and wouldn't wake when I moved the phone away from my face. I had to hit power button to wake phone and enter pin just to end a call. I make/recieve over 100 calls per day and it was getting old til I found this app. Works perfectly every time.
Thanks but that's not the same issue. Mine will not wake at all. I have to force a reboot to get display
You might give the app a try just to see. It keeps the screen on during a call but the proximity sensor still shuts the screen off unless you are on speaker phone. It may not work, but worth a try to keep your N6!
I've seen the same thing with my N6, display goes black (randomly, not even related to a call) and the only thing I can do is reboot. Haven't wasted any time looking for a solution, 'cause I don't think there is an easy one and there is no way to know if something you try is even going to work! I just reboot and move on.
Just posting to let you know you are not crazy and there is someone else out there with the same problem!!!
I'm not sure what you mean. I've been recommended this app before but I don't like the idea of mybscreen being on.
What do you mean it keeps the screen on but proximity still shuts it off? .
Thanks for confirming
Basically it doesn't let the screen timeout. Proximity sensor still functions like normal.
I would try it and see.
If it helps good, if not no harm. It definitely fixed my issue, even if my issue wasn't exactly what you're experiencing.
Well power button end call didn't help. I don't think it is a proximity sensor issue. Let's hope it happens when I can get a logcat. Unlikely. Maybe a job for tasker.
I had this issue too. I eventually thought it was tied to UV, but then I installed all stock and didnt change anything and it still happened. Maybe a bug in lollipop.

Unresponsive fingerprint sensor

Hey guys,
Recently, I've been having issues with my fingerprint sensor/unlock screen. Sometimes when I pull my phone out of my pocket and attempt to unlock the phone witht he fingerprint sensor, it won't respond. I then press the power button, which turns the screen on and when I use the fingerprint sensor, i can feel the vibration from the button but the screen does not unlock. There is also no fingerprint icon at the bottom. I can't unlock by swiping and putting in my password either. This eventually fixes itself after 30-45 seconds, but its really annoying when I want to use my phone. I've tried switching launchers, thinking that this might have been the problem, but this did not fix it.
I'm running stock OxygenOS 4.1.6, kernel [email protected] #1. I'm using the google launcher currently.
Its something to do with the light sensor cause i have it happen at night time when i am listening to podcasts in bed, it comes up to press one of the volume buttons and back to bypass it - but after 10 seconds it lets you unlock it anyway?
Pocket mode, try turning that off. Pocket mode uses the proximity sensor (I think) to detect whether it's in a pocket or not. If it is, then the fingerprint scanner will refuse to work so as to prevent accidental touches in the pocket
Turned it off last night. It's still happening. And it happens even when the phone is sitting on my desk. I go to try and unlock it and it won't respond.3
Delete and reset them. I find it happens after a month or so of use. I'm on Sultans marshmallow.
Originally when it happened I thought the ROM had gone bonkers and flashed back to stock. I missed the battery life too much on the CM13 build so I tried his marshmallow again. And guess what? It happed again. So I just deleted them and reset my fingerprints and voila! Snappy again.
Let me know if it works for you!
Just delete your current fingerprints and reset them. Should become snappy once again.
Happened to one of my friends and that's how I fixed it for him.
Cheers.
Never had issues with. Maybe you use it wrong side of finger, i mean you must unlock with you finger horizontally and not vertically finger
moSess said:
Delete and reset them. I find it happens after a month or so of use. I'm on Sultans marshmallow.
Originally when it happened I thought the ROM had gone bonkers and flashed back to stock. I missed the battery life too much on the CM13 build so I tried his marshmallow again. And guess what? It happed again. So I just deleted them and reset my fingerprints and voila! Snappy again.
Let me know if it works for you!
Click to expand...
Click to collapse
My phone has started acting wonky, not only with the finger print sensor but sometimes the touchscreen will become unresponsive, but I'll be able to turn the screen on or off. I'll have to try resetting tonight.

Lift to wake stops working periodically

I just picked up an XZ2 for a steal. So far I really like the phone, but one thing has really been nagging me. The lift to wake functionality works pretty well most of the time, but occasionally, it will just stop working completely. It's like the phone goes to sleep and stops recognizing the sensors or something. It doesn't happen after sitting for a long time, either. It actually happens right after I've been using it. Today, the screen timed out and went black and no matter how much I shook the phone, put it in my pocket and took it out, etc., it never worked again until I hit the power button.
Before someone suggests just hitting the power button or fingerprint sensor: You're missing the point. I shouldn't have to. It's bad enough that Sony took tap-to-wake from us and never gave it back. But I expect this feature to work consistently. Really, you should rarely, if ever, have to hit the power button. A similar feature on the iPhone works without fail almost 100% of the time.
I'm just looking to see if anyone else has experienced this. The phone is fresh out of the box, has the latest build (51.1.A.4.225) and was set up manually, not restored from a cloud backup. Has anyone else seen this?
Oh yes, it is one of three really small, miniscule bugs I've got with my XZ2. In my case, the lift to wake only stops working a few times and after I wake the phone manually, it works the way it should work again. But it only happens in those rare times.
AlvinZahran98 said:
Oh yes, it is one of three really small, miniscule bugs I've got with my XZ2. In my case, the lift to wake only stops working a few times and after I wake the phone manually, it works the way it should work again. But it only happens in those rare times.
Click to expand...
Click to collapse
Thanks. Yeah, it's annoying. The inconsistency drives me crazy. It seems to have something to do with the screen timeout.
I wish they would just give us proper tap to wake back.
Sent from my H8266 using Tapatalk

Fingerprint sensor issue

If my phone is sitting on the desk and I pick it up to unlock, the fingerprint sensor will only detect my finger on the second press. Once I've got it in my hand and lock it, it will unlock every time. But if I put it back down and pick it up, it will only work on the second press. It happens every time.
Anyone else found this?
I tested few times but I couldn't reproduce your finding.
Maybe you have activated some of the movement control settings, on my phone I don't have any.
themissionimpossible said:
I tested few times but I couldn't reproduce your finding.
Maybe you have activated some of the movement control settings, on my phone I don't have any.
Click to expand...
Click to collapse
I haven't enabled anything as far as I know. I turn most things off I don't need, especially gesture related as I never use any of it. Perhaps it's faulty somehow. I guess now's a good time to get it replaced due to the hulkified display.

Serious practical problem lock screen

Strange thing is happening recent to me...
Namely, while using headphones while talking on the phone, the unit gets unlocked while in pocket and problems arise with spontaneous keys getting activated.
If even cannot be explicitly locked by pressing the power button.
Have not found a solution to this problem, and it's strange why the proximity sensor does not work in pocket.
Cannot remember whether this was previously, or is it since last ROM upgrade.
Anyone having same problem?
tomsag said:
Strange thing is happening recent to me...
Namely, while using headphones while talking on the phone, the unit gets unlocked while in pocket and problems arise with spontaneous keys getting activated.
If even cannot be explicitly locked by pressing the power button.
Have not found a solution to this problem, and it's strange why the proximity sensor does not work in pocket.
Cannot remember whether this was previously, or is it since last ROM upgrade.
Anyone having same problem?
Click to expand...
Click to collapse
Yep I have the same thing... Today my pocket took 9599295 pictures and movies.. also when I'm a bit sweat my pocket dial random numbers. I've noticed that when screen is touched and disnt recognize fingerprint then whole lockscreen shows up and its easy way to random open dial or camera... Its rly anoying, because I dont want to hide phone screen outside of the skin. (Its easier to break screen if I hit something with my leg.)
Dunno why it doesnt use proximity sensor to recognize that phone is in the pocket like every other brand... :/
Do you have the double tap to wake up activated?
I had this problem a while ago and it was the double tap that played all kinds of tricks calling emergency and taking pictures in my pocket! Disable double tap to wake up screen and the problem goes away.
Disable the fingerprint icon on when the screen if off.
Gokh said:
Disable the fingerprint icon on when the screen if off.
Click to expand...
Click to collapse
Tried everything but the problem is eventually still there. Actually I've found a bug, namely the display will wake up once touched several times near the center of the fingerprint reader. Try it yourself.
Not nice - cannot avoid to happen it sometimes even if all options are disabled.
tomsag said:
Tried everything but the problem is eventually still there. Actually I've found a bug, namely the display will wake up once touched several times near the center of the fingerprint reader. Try it yourself.
Not nice - cannot avoid to happen it sometimes even if all options are disabled.
Click to expand...
Click to collapse
I didn't have this problem. If I try now and touch the part with the scanner, doesn’t have to be just the centre of the scanner, rapidly around ten times the lock screen will turn on, but nothing happens when I touch the shortcuts. Perhaps they are disabled, so the only thing that happens if the scanner is touched again is that the numpad to unlock with pin appears.
This is not good as it may severely affect battery life if it happens a lot. This clearly must be a bug!
gerhard_wa said:
I didn't have this problem. If I try now and touch the part with the scanner, doesn’t have to be just the centre of the scanner, rapidly around ten times the lock screen will turn on, but nothing happens when I touch the shortcuts. Perhaps they are disabled, so the only thing that happens if the scanner is touched again is that the numpad to unlock with pin appears.
This is not good as it may severely affect battery life if it happens a lot. This clearly must be a bug!
Click to expand...
Click to collapse
Even worse, since it is happening all the time while on a call via BT and my phone is in the pocket. I am now thinking about to switch over to my old MI8...
Cannot understand why the keyboard is not disabled in the pocket. Seems so easy to do it but it's as it seems on.
tomsag said:
Even worse, since it is happening all the time while on a call via BT and my phone is in the pocket. I am now thinking about to switch over to my old MI8...
Cannot understand why the keyboard is not disabled in the pocket. Seems so easy to do it but it's as it seems on.
Click to expand...
Click to collapse
My only solution was to buy a flip case. At first, I disabled the fingerprint reader by removing all fingerprints and setting up face recognition, but this didn’t fix the problem you are talking about. I don’t really like flip cases, but the Nillkin QIN Smartcase is rather good.
So now I ‘m eagerly awaiting a fix from Xiaomi so I can strip the Mi9 again!
Gokh said:
Disable the fingerprint icon on when the screen if off.
Click to expand...
Click to collapse
Where can the fingerprint icon be disabled? Thank's.
j4dotcc said:
Where can the fingerprint icon be disabled? Thank's.
Click to expand...
Click to collapse
Disabling the fingerprint icon has no effect on the problem we are talking about here. The only way to make the problem go away is to remove all the stored fingerprints thus disabling the use of fingerprints all together. This will shut off the fingerprint sensor doing away with this problem in a crude way.
If you really are looking for a setting, please use the search function at the top of the settings.
gerhard_wa said:
Disabling the fingerprint icon has no effect on the problem we are talking about here. The only way to make the problem go away is to remove all the stored fingerprints thus disabling the use of fingerprints all together. This will shut off the fingerprint sensor doing away with this problem in a crude way.
If you really are looking for a setting, please use the search function at the top of the settings.
Click to expand...
Click to collapse
Thanks for the prompt reply. I don't have the problem and just wanted to know where I can disable the fingerprint icon. Thanks again.
New uppdate out that include Pocket Mode. MIUI-V10.2.27.0PFAEUXM EEA version.

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