fingerprint reader freezes, wont register, and not responding - Xiaomi Mi 9 Questions & Answers

I bought my mi 9 2 days ago and it all worked fine. But today I've noticed that sometimes it will not register a touch, it stays as a fingerprint icon. Also, there was about 2 times it froze, like the icon froze while it was scanning, I had to unlock the phone by pin to get rid of it. Sometimes, I also notice that I have to press multiple times to get it to read, my finger is dead centre of the reader, but I still have to touch it multiple times. Anyone having the same issue or has a solution?

I also deleted and reregistered my finger multiple times. I'm on 10.2.13.0, btw.

I had this too until I added the same finger multiple times. Add the finger you are most comfortable with using as many times as you can.
When I do this it works almost every time, perhaps 19 out of 20.

10.2.13 here too.
I am able to reproduce the problem most of the times: having the phone in my pocket, I take it out and try to unlock. The reader does not respond, or it just lights and goes off cyclically as if it was retrying, yet no retry notification. If I doubletap to activate lock screen, it works like a charm.
Activating the rotation gesture to activate the unlock screen mitigates this, but other problems arise. If the phone is on the table, the only solution is to doubletap or to hit power to activate the unlock screen.
I read somewhere that it is a wakelock issue. I deoptimized the energy in the biometrics app via miappa, but the problem is still there.
Any solution?

chospo said:
10.2.13 here too.
I am able to reproduce the problem most of the times: having the phone in my pocket, I take it out and try to unlock. The reader does not respond, or it just lights and goes off cyclically as if it was retrying, yet no retry notification. If I doubletap to activate lock screen, it works like a charm.
Activating the rotation gesture to activate the unlock screen mitigates this, but other problems arise. If the phone is on the table, the only solution is to doubletap or to hit power to activate the unlock screen.
I read somewhere that it is a wakelock issue. I deoptimized the energy in the biometrics app via miappa, but the problem is still there.
Any solution?
Click to expand...
Click to collapse
Flash a custom rom. Xiaomi.eu fixes alot of problems with MIUI 10

kaydentc1 said:
Flash a custom rom. Xiaomi.eu fixes alot of problems with MIUI 10
Click to expand...
Click to collapse
What's the latest EU ROM version for the Mi 9? I'm a little bit confused on their site.

RebornCheiko said:
What's the latest EU ROM version for the Mi 9? I'm a little bit confused on their site.
Click to expand...
Click to collapse
Get the latest pie build. 9.8.1

Related

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!
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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.

Extremely unresponsive when trying to unlock with pattern

After upgrading to Lineage OS 15.1, I realize that if I have screen lock set to pattern, then it is extremely hard to unlock when the screen has been off for a while. The screen will stay black while when I'm holding power button the phone will vibrate as if I'm calling power menu. This black screen can last at least one minute. I also set long press to open flashlight when screen is off and that doesn't work. Those symptoms makes me believe that the phone is awake, yet for some reason can't get GUI rendering. Sometimes even when I enter the correct pattern and the animation moves dots and timer away, I can still draw unlock pattern on the hiding unlock dots, and phone will vibrate in a very laggy manner.
Currently I'm running with no screen lock as even "swipe" still cause the unlock process to be very painful. Is this a known issue for LOS or is there a way to fix it? I saw a post says the battery should be replaced if phone is laggy. Is that a possible cause?
LolitaPlus said:
After upgrading to Lineage OS 15.1, I realize that if I have screen lock set to pattern, then it is extremely hard to unlock when the screen has been off for a while. The screen will stay black while when I'm holding power button the phone will vibrate as if I'm calling power menu. This black screen can last at least one minute. I also set long press to open flashlight when screen is off and that doesn't work. Those symptoms makes me believe that the phone is awake, yet for some reason can't get GUI rendering. Sometimes even when I enter the correct pattern and the animation moves dots and timer away, I can still draw unlock pattern on the hiding unlock dots, and phone will vibrate in a very laggy manner.
Currently I'm running with no screen lock as even "swipe" still cause the unlock process to be very painful. Is this a known issue for LOS or is there a way to fix it? I saw a post says the battery should be replaced if phone is laggy. Is that a possible cause?
Click to expand...
Click to collapse
This isn't a known problem.
From what did you upgrade?
Which build are you using?
Did you do a clean install?
Which gapps are you using.
Do you have Expanded Desktop enabled?
Elektroschmock said:
This isn't a known problem.
From what did you upgrade?
Which build are you using?
Did you do a clean install?
Which gapps are you using.
Do you have Expanded Desktop enabled?
Click to expand...
Click to collapse
I was using Stock Android before, but I fully wiped everything before I install.
15.1-20180508-NIGHTLY-shamu
Yes.
I got my GApps from Open GApps, but didn't remember which variant but most likely nano.
I actually have this enabled. I'm gonna disable it and see how that works.
After turning off Expanded Desktop the issue seems to be gone. Though when turned on again after some times the lag is still somewhat exist.
there's a Xposed module fix for this http://repo.xposed.info/module/fr.merams.r.deepscreenoreo

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.
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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?
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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.
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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.
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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!
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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.
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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.
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Where can the fingerprint icon be disabled? Thank's.
j4dotcc said:
Where can the fingerprint icon be disabled? Thank's.
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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.
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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.

Face unlock Double tap to sleep

I use a widget called screen tap to lock or something or another for the double tap to sleep on any launcher. Have been using it for a while across a few phones. However when I got the S10 I just started using face unlock due to this slow and clunky FP sensor.....but I've discovered this issue where double tap to sleep with face unlock on makes the phone immediately wake back up to the lock screen for a second unlike pressing the power button which acts correctly. I tested it out on nova's built in settings without the widget (which I was using on one UI launcher) and it does the same thing so obviously it's some sort of conflict with face unlock and double tap to sleep. Anyone know why?
carnivalrejectq said:
I just started using face unlock due to this slow and clunky FP sensor.....
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Click to collapse
Wait, slow and clunky? Maybe off topic but mine is extremely consistent after they fixed it like 4 months ago. Maybe relearn prints and make sure you get the whole thumb scanned.
Also I have double tap to sleep setup on Nova using accessibility as screen lock method and tried your scenario with face unlock enabled, but did not encounter your issue on Android 10
Ripthulhu said:
Wait, slow and clunky? Maybe off topic but mine is extremely consistent after they fixed it like 4 months ago. Maybe relearn prints and make sure you get the whole thumb scanned.
Also I have double tap to sleep setup on Nova using accessibility as screen lock method and tried your scenario with face unlock enabled, but did not encounter your issue on Android 10
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Click to collapse
Oh, I'm on cricket in the US , so still stuck on 9 (with no hope in sight for 10 lol). I've deleted them and reset them a few times now and idk it's just not as fast as I'm used to with capacitive ones, there's an extra second, even compared to the one in the OnePlus 7t I was using for a few days , it cannot compete. It works a lot better if you press hard and firm I guess, but again I'm not used to that. But yeah idk why it's doing that, did it to me on Nova too if I use double tap to sleep at all it immediately opens back up to the lock screen. I don't think it's looking for my face in that scenario either because it doesn't face unlock when it does it, but it definitely IS happening because of the face unlock because it doesn't happen if I turn it off altogether and use the double tap to sleep......if I press the power button to turn the screen off this does not happen.

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