This is how the fingerprint scanner bug affects Xiaomi Mi A2 battery performance (left: scanner on / right: scanner off) in a normal day of use
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That’s probably a hardware problem.
For those of you who don’t know, the scanner has a metalic ring around it. Only when the ring detects touch, the scanner starts scanning.
That’s literally what it means.
Delete all the fingerprints, then restart the phone, that should fix the problem. Good luck.
Actualy i love this phone, if they fix this issue it will be the perfect phone, at least for me
I’ve heard that some mi a2 lite users have the problem too
A mi me esta pasando algo parecido con el Redmi Note 4x (4gb 64gb)
Something similar is happening to my Redmi Note 4x (4gb 64gb)
I have note 4x, you need to enable developer options by tapping miui version 5 times
How do we know which fingerprint scanner we have?
Same here, 4/32 model
Me too but its a global redmi note 5. After a few fingerprint unlocks the cpu clocks maxes out and stay like that untill reboot
CPU-Z and CPU info
Confirmed on my girlfriend’s A2.
But,.this got me thinking – all of the Mi A2 reviews are wrong about the battery life of this phone.
Si, versión global, 4/64 GB .
I mean :CPU usage 100%
So no.
I had this problem on my asus m1 pro. Goodix fingerprint scanner but asus fixed it.
So only Goodix’ sensors have this bug?
I hope so, its stupid have a fingerprint scanner i cannot use it bacuse it causes hyperactivity in the phone. meh
This is why I’m keeping my other phone still, until they figure this out
https://play.google.com/store/apps/details?id=com.abs.cpu_z_advance
Because the fingerprint sensor of your device is not from goodix.
I can confirm. Problem is with goodix fp, I have fcp and my friend has goodix fp difference is clear.
Gracias
Same is happening even with the pie update.It really suuucks!!
How did you measure CPU levels?
How do I check what fingerprint scanner I have
I have redmi note 5 ai
Have the same problem even after disabling fingerprint sensor.
After using face unlock and PIN for 2 days and every thing is ok, now the 100% cpu frequency comes back again.
So I think this issue is not fingerprint related directly.
Maybe the kernel.
The bug isn’t affecting everyone, and it’s also very difficult to be reliably tracking across users when the bugs were first experienced, whether something has changed in updates past the original software version things shipped with, etc. I wouldn’t jump to the immediate conclusion that it is reviewers being wrong or dishonest.
tienes la versión global?
Which app are you using?
I think the problem lies in the developer setting “miui optimisation” because I only started having this problem after turning that setting on
Sí, parece que algunos usuarios con miui también les está afectando, pero desconozco dónde reside el problema. Con el Mi A2 ya hice pruebas por algunos días y está bastante claro que el sensor de huellas es donde comienza el problema.
Yo también tengo un Mi A2 pero sin el problema, Sensor Fpc, 6 hrs de pantalla fácilmente. Lamento que te haya tocado el Bug
Mines the 64
I used instead face Unlock as a temporary solution until fixing the issue by xiaomi.
This is huge! I just assumed it was the “tiny” battery!
I’m out of juice by 3pm!
Edit. I just deleted all my prints. CPU is now fluctuating in CPU-Z which I’m guessing its suppose to be instead of being at full speed!
I actually bought a Pocophone because I was disappointed in the battery life!
download the cpu-z app
Still need more info, but all points that the bug starts with the fingerprint scanner, when you have fingerprints to unlock your phone, all cores of the CPU run at the maximum power all the time even when the phone is idle, that drains the battery.
If you turn off the fingerprint unlock, the CPU works normal.
Since i bought this phone 2 months ago i notice that the battery performance was strange, with 100% of battery down to 90% in 2 or 3 hours of idle phone. Now some users reports that it is a bug of the scanner.
Well it’s still a possibility.
“It’s also clear that not everyone is experiencing this battery draining bug even though they are using the fingerprint sensor. So, while it may be a pain, the current temporary fix is to reboot the Xiaomi Mi A2 every now and then. The sad part is that as of yesterday, the Xiaomi developer team has yet to acknowledge this as a bug with one community member involved saying they were told the dev team doesn’t “trust apps like CPU-Z/AIDA64.”
https://www.xda-developers.com/xiaomi-mi-a2-massive-battery-drain-fingerprint-sensor-bug/
Can we have some confirmation on this? I’m considering selling my device for either a pocophone or a mimax
I just noticed that all of the options in smart lock disappear whenever the bug triggers.
I have redmi note 5 ai (Chinese variant) and has cou usage 100% all the time.
Cause not being known doesn’t mean it wasn’t verified
Is this a verified bug?
I’ll try to disable fp and report, though it would be a bit frustrating to unlock the phone now. :l
yo ordené hace unos días la versión global de 4/64 GB, espero que no me toque el bug.
I’m trying it… let’s see what happens. thanks
this is verified bug
https://www.xda-developers.com/xiaomi-mi-a2-massive-battery-drain-fingerprint-sensor-bug/amp/
De nada!
Mi A2 user here. For me it’s fine, no problems like that
And top comment have nothing to do with thread. What a sub. Snapdragon goes to max clock after unlocking phone with goodix fingerprint sensor and stays there until you reboot phone.
It is so obvious by now.
If you dont have that, you have other sensor.
I have the issue 🙁
Joder, he hecho pruebas y se nota la diferencia. Gracias por postearlo!!
I turned off the scanner and then restarted the phone, that solved it, but sucks cant unlock the phone with fingerprint
Having the 64GB version, I havent had any problems with this. Normal use ends up at about 40% regardless of using the fingerprint scanner.
Thank you
Detele all fingerprints fron the settings
Where is that option? And which phone you have
Until now it seems to be the goodix sensor affected by this bug.
does it also affect Mi A2 Lite or just Mi A2? Thanks
I did some test in variuos conditions, with multiple apps for check the CPU performance. When i have fingerprints registered to unlock the phone the apps registered the maximum power in all 8 cores all the time and dont stop or down, even when the phone is idle, thats causes the battery drains quick.
I turned off the finger scanner and reboot the phone, then all the 8 cores down to normal power levels and constantly up and down as should be. In this case the battery long almost 8 hours of screen.
With the scanner turned on, the 8 cores stucks at max power and never down. If i reboot the phone works normally for a couple of minutes, later the cores up and stuck. In this case is hard to get 4 hours of screen.
https://www.reddit.com/r/Xiaomi/comments/9krzws/xiaomi_mi_a2_users_report_fingerprint_sensor_bug/?utm_source=reddit-android
Check this in the comment shows a command to see wich finger scanner you have
How can I disable fingerprint? Just deleting the fingerprint that I’ve registered?
Or if I don’t use it, will be the same?
Can you elaborate on the bug?
No importa la versión, solo tienes que checar que el sensor de huellas sea tipo Fpc y no Goodix, solo los que tienen el Goodix tienen el bug
I have fcp too and even though it’s supposedly not effected, disabling my fp scanner has caused a noticeable difference
How do you turn off the scanner?
> The battery drain is caused by all CPU cores being pegged at max speeds, but the exact cause of this issue is unknown at this time.