Biometric sensors are sleeping? - Redmi K20 / Xiaomi Mi 9T Questions & Answers

Hello, I'm very disappointed with the fingerprint sensor and the face unlock:
when I try to unlock my device after some time, the fingerprint is very slow, also the camera is revealing after 1 or 2 secs after the swipe. But if I unlock - lock - unlock again both methods are fast like they should be.
I think there is something putting them in stand-by to prevend battery drain, but is very very very very annoying and frustrating.
Is there any way to fix this?
Thanks!

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APP Wanted - Stylus Lock

Im after a app that will lock my htc diamond touch when i got my stylus plugged in and unlock it when i got it out ive managed to find one but it only works with roms with clocks above the battery my rom has not got this instead it has the battery life % so i would a appreciate if someone could make one of these apps private message me if anyone knows of one that already exists
use s2u2 it has that feature
i just downloaded it and it said something about double locking if i dont turn it off think it was soft lock or summit how do i turn this off
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sorted finally figured out how to turn off my rom locking system fully and now with s2u2 it locks when stylus is in and unlocks when i take it out
pocketshield does this and many more
see Touch Lock Pro
it has many features: G sensor lock, Light Sensor lock, Stylus lock, Keyboard lock (for other models), HW touch lock, proximity lock etc.
you can enable/desable features according to your personal choicse
edit: s2u2 uses a lot of memory, but it uses about 34kb
hear you are works
ok install 1.1
then 1.7 and wallah

Unlock my S7 without click on the home button

hello
I have a question
One member know a software or a modification for the fingerprint?
Because when i use my fingerprint first i click on the home button and after i see the lockscreen and after my finger is readed
On huawei/Honor phone when i put my finger on the fingerprint the fingerprint unlock my phone without go on lockscreen
So do you have a solution for the same way of unlock as honor/huawei?
Thanks !!
No
there is one way to do that...turn on your edge feed...when your screen is lock..swipe up and down on the edge screen til your edge feed come out..then scan your fingerprint..it will unlock your phone without hitting any button..
Passive fingerprint reader
quadeur06 said:
hello
I have a question
One member know a software or a modification for the fingerprint?
Because when i use my fingerprint first i click on the home button and after i see the lockscreen and after my finger is readed
On huawei/Honor phone when i put my finger on the fingerprint the fingerprint unlock my phone without go on lockscreen
So do you have a solution for the same way of unlock as honor/huawei?
Thanks !!
Click to expand...
Click to collapse
I know the Problem you are facing,
That's because the readers on Other phones like one's you mentioned are having an Active Fingerprint Reader which is always scanning your print even on Screen Stand-By
Samsung phones on other hand have a Passive Fingerprint Reader that gets activated by the press of the button only and so it wont scan the fingerprint until the screen is activated by any means - either you press the home button of Activate the screen by Edge Feed (swipe Up and Down on Edge)
This is a Tad Bit of less convenient because of Passiveness but it has important safety precautions like
1) phone does not get opened up if you accidentally touch the sensor in pocket
2) press is better because you can feel the pressure and know if someone pranks you while you are sleeping
3) fingerprint reader uses less ram and less battery because of being inactive most of the time
"But I do Confess that Samsung Phone's Fingerprint Sensors are Slow Compared to Many Other Phones even if we Test While screen of on"
I've got the LED case for the phone, when i flip it open i just hold my finger over the sensor.
Unlocked without pressing buttons
Thans for all the answer
I understand now
MethMargera said:
there is one way to do that...turn on your edge feed...when your screen is lock..swipe up and down on the edge screen til your edge feed come out..then scan your fingerprint..it will unlock your phone without hitting any button..
Click to expand...
Click to collapse
Wow nice! i had no reason to keep edge feed on, now i do, i came from OP3, so i miss the super fast fingerprint scanner

Moto g5 plus Fingerprint problem.

I am having this slight delay in the fingerprint unlock when the device is off. There is a momentarily black screen. It is fine when I use the fingerprint to unlock the device when it is on. Please gimme some solution to this problem.
It makes sense to have a moment delay. I'd your phone is asleep, the device needs to recognize the touch, wake up the sensor, then wake up some of the CPU to compare the read vs. stored fingerprint, as well as get the stored from memory. There will be a short delay in there.

Moto E4 XT1767 Fingerprint Scanner Lag

I picked up this phone on my local craigslist late last week (at $15, I could not resist), unlocked it, and have been using it. When compared to my moto Z play, I have to hold the fingerprint scanner longer to turn the phone on or off which for some reason is very frustrating. I do not believe this is a hardware limitation as the fingerprint response is instant if I turn the device on to my lock screen and then touch the fingerprint scanner.
Does anyone know if it is possible to correct this? At the moment, I have to touch the scanner for ~1 second before it will turn on/off my phone. If it were possible to change this to ~0.5 seconds, I would be a happy camper.
skotseno said:
I picked up this phone on my local craigslist late last week (at $15, I could not resist), unlocked it, and have been using it. When compared to my moto Z play, I have to hold the fingerprint scanner longer to turn the phone on or off which for some reason is very frustrating. I do not believe this is a hardware limitation as the fingerprint response is instant if I turn the device on to my lock screen and then touch the fingerprint scanner.
Does anyone know if it is possible to correct this? At the moment, I have to touch the scanner for ~1 second before it will turn on/off my phone. If it were possible to change this to ~0.5 seconds, I would be a happy camper.
Click to expand...
Click to collapse
Are you running stock software? If so, I'd try erasing and re learning your finger prints. I got an E4 for my daughter to use on WiFi - FP sensor is snappier and more accurate than my MZP. If that doesn't do it, I'd be inclined to think hardware issue.
dandrumheller said:
Are you running stock software? If so, I'd try erasing and re learning your finger prints. I got an E4 for my daughter to use on WiFi - FP sensor is snappier and more accurate than my MZP. If that doesn't do it, I'd be inclined to think hardware issue.
Click to expand...
Click to collapse
Well here is the thing: when the phone is on the lock screen (screen turned on and asking for fingerprint or pattern/pin) the fingerprint sensor is instant and always accurate. The only time I am seeing lag is when I hold to turn the screen on (the screen is off but holding the fingerprint sensor turns it on) or off (phone is on and unlocked but holding the fingerprint sensor turns off the screen).
Can you confirm that your daughters phone has a faster response when turning on/off the screen?
i've read from a handful of reviews that the scanner is just simply not as fast as the MZP or even g5+. could be a limitation of the processor? i moved from a MZP to the e4, definitely a noticeable difference in speed.
skotseno said:
Well here is the thing: when the phone is on the lock screen (screen turned on and asking for fingerprint or pattern/pin) the fingerprint sensor is instant and always accurate. The only time I am seeing lag is when I hold to turn the screen on (the screen is off but holding the fingerprint sensor turns it on) or off (phone is on and unlocked but holding the fingerprint sensor turns off the screen).
Can you confirm that your daughters phone has a faster response when turning on/off the screen?
Click to expand...
Click to collapse
Yep, the times I use it, it's normally from screen off condition, or from in use to lock/turn off screen.
I'll try to do a side by side tonight with my MZP
dandrumheller said:
Yep, the times I use it, it's normally from screen off condition, or from in use to lock/turn off screen.
I'll try to do a side by side tonight with my MZP
Click to expand...
Click to collapse
here's a link to a quick head-to-head video. What is apparent is that the other poster is indeed correct - MZP is slightly faster from touch to screen on, and touch to screen off. The difference is slightly more pronounced when waking than going to sleep. What isn't apparent from the video is the timing of the haptic feedback. On the MZP the vibration is triggered almost instantly at touch, with the bulk of the delay from touch to screen on happening after the vibration triggers. On the E4, the vibration occurs around the middle of the span from touch contact to screen on. This gives the impression in use, at least to me, of slightly more laggy sensor (on the E4) but slightly faster unlock times (on the E4).
Guess I don't have to be jealous of my kid's phone anymore. Was a cool experiment.

Make lock screen easier to unlock?

Is there some way to make the unlock swipe more sensitive? Or a shorter swipe required?
Sometimes it takes me 4 or 5 swipes to get it to unlock, it's getting a tad annoying. No other issues with the screen, it just seems to need far too long of a swipe to allow the unlock.
I don't use fingerprint / pin / face unlock.
ummduh said:
Is there some way to make the unlock swipe more sensitive? Or a shorter swipe required?
Sometimes it takes me 4 or 5 swipes to get it to unlock, it's getting a tad annoying. No other issues with the screen, it just seems to need far too long of a swipe to allow the unlock.
I don't use fingerprint / pin / face unlock.
Click to expand...
Click to collapse
I don't believe there is, but why wouldn't you use any of the above ? They're all ironically extremely fast, the fingerprint unlock is probably the quickest out of any phone in the world. The face is also rapid.
You could maybe install another lock screen but it would probably be quite similar.
There is more than likely also a setting in the ROM which altered the length of swipe, not in settings but an actual value within a file.
dladz said:
I don't believe there is, but why wouldn't you use any of the above ? They're all ironically extremely fast, the fingerprint unlock is probably the quickest out of any phone in the world. The face is also rapid.
You could maybe install another lock screen but it would probably be quite similar.
There is more than likely also a setting in the ROM which altered the length of swipe, not in settings but an actual value within a file.
Click to expand...
Click to collapse
My finger tips/prints get pretty tore up at work and causes finger print readers to be all but useless.
Not a fan of face unlock, too many situations that it would be inconvenient. I suppose I could maybe try a simple pattern unlock instead, I tend to open my phone is awkward situations sometimes and want it to be easy to get into. I have no security concerns.
ummduh said:
My finger tips/prints get pretty tore up at work and causes finger print readers to be all but useless.
Not a fan of face unlock, too many situations that it would be inconvenient. I suppose I could maybe try a simple pattern unlock instead, I tend to open my phone is awkward situations sometimes and want it to be easy to get into. I have no security concerns.
Click to expand...
Click to collapse
Have you actually tried the face unlock? I wasn't completely for it, but it's very quick and you barely have to look at the screen, it's also surprisingly accurate.
Did you know you can register several fingertips? So unless your whole hand gets messed up? I used to do ground work and roofing, bricklaying so I know what you mean. Should be ok tbh.
ummduh said:
Is there some way to make the unlock swipe more sensitive? Or a shorter swipe required?
Sometimes it takes me 4 or 5 swipes to get it to unlock, it's getting a tad annoying. No other issues with the screen, it just seems to need far too long of a swipe to allow the unlock.
I don't use fingerprint / pin / face unlock.
Click to expand...
Click to collapse
I have the same problem, and it's not only unlocking the screen.
Sometimes I try to swipe down notification 4-5 times before it works.
On Lineage/Resurrection rom it's working like any other phone.
There is one more thing, this bug is inconsistent, sometimes unlocking is working like it should and slightest swipe unlocks the phone.

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