yashsingh1/xdaforums huggingface dataset:
[Xiaomi Mi A2 / 6X Questions & Answers] ojetepicor:
This increasingly smells more of a hardware defect.

A few days ago I thought about waiting for the September update to correct it before returning it, but I thought ... "What the hell! When they fix it, I'll buy it again."

Luckily I sent it back to the seller before the expiration of the return period. Happy!
[Xiaomi Mi A2 / 6X Questions & Answers] engineer000:
guys, anyone who stopped using fingerprint to open the phone that still have the same issue?

Thanks
[Xiaomi Mi A2 / 6X Questions & Answers] akatsukiclan1:
I still have the issue
[Xiaomi Mi A2 / 6X Questions & Answers] Mixz1890:
Well....One solution would be to change out the fingerprint sensor yourself. You can get them on aliexpress for 3-4$ but the problem is we don't know how FPC or Goodix sensors look like and what are the differences.

Anyway, what color phones do you have guys? And state wether you have the problem or you don't.

It just looks like the red ones have a little different fingerprint sensor than the black or blue ones - at least according to aliexpress.
[Xiaomi Mi A2 / 6X Questions & Answers] engineer000:
Thanks. I guess it is time for a refund. Which model is better? mi a2 lite or Xiaomi Redmi Note 5 AI Edition?
[Xiaomi Mi A2 / 6X Questions & Answers] Mixz1890:
Personally I'd take RN5 just because it has MIUI and has been out for longer time meaning it has custom ROMs
[Xiaomi Mi A2 / 6X Questions & Answers] engineer000:
one option I have is the nokia 6.1? is it a bad idea compared to RN5 AI Edition?
[Xiaomi Mi A2 / 6X Questions & Answers] Mixz1890:
RN5 will be much faster compared to both - Nokia 6.1 and Mi A2 Lite.
[Xiaomi Mi A2 / 6X Questions & Answers] engineer000:
cool.
[Xiaomi Mi A2 / 6X Questions & Answers] Ravenlll:
With such relation to customers how do you still choosing their products? Maybe wait for Nokia 7.1 Plus? But need a time.
[Xiaomi Mi A2 / 6X Questions & Answers] jblanco93:
Please go to another thread if you're not helping or looking for help about CPU

Enviado desde mi Mi A2 mediante Tapatalk
[Xiaomi Mi A2 / 6X Questions & Answers] tomgv:
I stopped using fingerprint and cpu frequency is normal, battery life is good, i get every time 6h SOT.

Sorry for my bad English
[Xiaomi Mi A2 / 6X Questions & Answers] engineer000:
I ended it by refunding the mi a2 and ordered Redmi note AI Dual cam. It will be my final phone for now. I will keep an eye here in this thread and once fixed, maybe I'll consider mi a2 again. I always use FP unlock and I am not used to unlock using Pin or pattern.
[Xiaomi Mi A2 / 6X Questions & Answers] Lurensu:
THE PROBLEM IS SOFTWARE ONLY. I've got a goodix sensor and the CPU issue with the stock "interactive" governor, however I'm using the ondemand governor for a month now and everything is nice and cool.

Obviously it's a big disappointment to see the lack of support by xiaomi and I think I will not buy a smartphone from them again, but please don't come here saying that it's a hardware issue and that it can't be solved.

If you want to replace your Mi A2, cool, just do it, but please don't come to this thread to discuss other smartphones, thanks.
[Xiaomi Mi A2 / 6X Questions & Answers] Membrillo007:
I guess this is OK, right?
[Xiaomi Mi A2 / 6X Questions & Answers] SirMorokei:
I have also the Goodix FP and the max frequency bug.

Scaling governor is set on interactive.

Android One (4/32), no root, not flashed

Tested the following things around 20 times:

- unlocked phone while in sleep/idle (black screen / used power button)

- unlocked phone while sleep/idle (black screen / screen timeout)

- unlocked phone while in pin request screen (used fingerprint to unlock)

- unlocked phone while in pin request screen (used pin to unlock)

Cpu don't got stuck after these tests. After around 7-12h of battery life the CPU got stuck.

I only use my phone for Spotify, WhatsApp, YouTube and browsing.

My guess is that it is an runtime error/bug.
[Xiaomi Mi A2 / 6X Questions & Answers] Nebrassy:
has any of you tried running a gsi and see if you get the bug there too? Long shot but maybe you won't get it there
[Xiaomi Mi A2 / 6X Questions & Answers] Ravenlll:
This good idea, if anyone knows how to do it and it's safe for the phone we can try. Also there is a new beta 8.9.20, does anybody tried?
[Xiaomi Mi A2 / 6X Questions & Answers] lamjanus:
I also have this sensor. Build date of device is 8-2018. I don't have this bug
[Xiaomi Mi A2 / 6X Questions & Answers] engineer000:
refunded one with goodix and bought a new 32 4gb ram + color blue and I got FPC sensor and works fine now.
[Xiaomi Mi A2 / 6X Questions & Answers] Ravenlll:
Does anyone tried to flash in EDL mode latest rom?
[Xiaomi Mi A2 / 6X Questions & Answers] mark.dx:
I just realized I got this problem too after checking CPU-Z the freq is locking up without any sign it will go down. I just hope they will resolve this issue since I just bought this phone 1 week ago and I don't want to replace it. For now I will using my previous phone Redmi Note 4.
[Xiaomi Mi A2 / 6X Questions & Answers] SirMorokei:
So I installed the second September update on Friday night and full charged my phone. Since than I don't have the stuck CPU bug anymore. At least in the current state. I will let you guys know if the bug comes back to life or if it's really gone for me.
[Xiaomi Mi A2 / 6X Questions & Answers] Ravenlll:
Many people reports that the bug come back at latest firmware. You need to wait for a while.
[Xiaomi Mi A2 / 6X Questions & Answers] mark.dx:
Has anyone tried this method ?

-Unlock Bootloader (needs to wipe the existing data)

-Setup as new device

-Wipe it again

-Lock Bootloader

Source : https://linustechtips.com/main/topic/970139-fixed-battery-drain-and-cpu-issues-mi-a2/
[Xiaomi Mi A2 / 6X Questions & Answers] SirMorokei:
Did you also read the "Edit" note?
[Xiaomi Mi A2 / 6X Questions & Answers] bornlivedie:
Sure, it says:

"After the security patch from September 21 the CPU stuck is no longer available at least for my device."
[Xiaomi Mi A2 / 6X Questions & Answers] Ravenlll:
On another forum one guy ask about revision of SoC. He has Goodix and there is no bug. He says that his revision is r10p2. My revision is r10p4. Also I check latest pages on miui forum and as per latest screenshots all of affected phones has r10p4 revision. Also one guy with FPC sensor and r10p4 reports that his frequencies also stuck (only first 4 cores on 1401mhz), and one more guy says that he was never affected my a bug (r10p4/FPC). It looks like the problem in SoC revision and maybe it is hardware issue, Goodix just trigger bug more often.

Is anyone here has some ideas? Can you check you SoC revision in CPU-Z?

Upd: one more user says that he has r10p2/Goodix and frequencies also stuck. Damn.
[Xiaomi Mi A2 / 6X Questions & Answers] Nebrassy:
I got r10p4/FPC, never got the bug
[Xiaomi Mi A2 / 6X Questions & Answers] vjchipie:
I have r10p2 with sensor goodix, and I have bug.

Enviado desde mi Mi A2 mediante Tapatalk
[Xiaomi Mi A2 / 6X Questions & Answers] SirMorokei:
r10p2/Goodix after the second September update I don't have the bug at least at the current state. It runs already 3 days without the CPU bug. I will report if the bug will show upagain
[Xiaomi Mi A2 / 6X Questions & Answers] evertonaperes:
solution ?

hardware or software? will it be that if I install another room will work the fp?

:rolleyes:
[Xiaomi Mi A2 / 6X Questions & Answers] jblanco93:
What use do yo make of the fingerprint?

Enviado desde mi Mi A2 mediante Tapatalk
[Xiaomi Mi A2 / 6X Questions & Answers] vjchipie:
Share here the message that I wrote in Xiaomi bug report. In this message explain perfectly requirements for issue occur.

Days ago I have used fingerprint without issue, because turn on screen with power button, and then unlock with fingerprint.

Details of this issue:

Requeriments:

Have a Goodix fingerprint sensor (You can use phone *#*#6484#*#* to see what sensor you have)

Use fingerprint to unlock smartform (If you turn on screen with power button and then use FP to unlock, issue not occurs; but if you with black screen use FP to turn on screen and unlock, then issue ocurrs). Obviously, if you don't use FP, you haven't issue.

Consequences:

Modify value of files: /sys/devices/system/cpu/cpu0/cpufreq/scaling_min_freq, ...., /sys/devices/system/cpu/cpu7/cpufreq/scaling_min_freq

In theses files, the value is put to max

Then frequency of all cpus run at max

Then battery drain

Enviado desde mi Mi A2 mediante Tapatalk
[Xiaomi Mi A2 / 6X Questions & Answers] MoldySoapBox:
I second this. Also got r10p4/FPC, no such bug.
[Xiaomi Mi A2 / 6X Questions & Answers] harry_martini:
i have r10p4 revision, goodix sensor and i also have the bug
[Xiaomi Mi A2 / 6X Questions & Answers] SirMorokei:
Unlock my phone.

Login in apps.

Payments (Google play store).
[Xiaomi Mi A2 / 6X Questions & Answers] juninhoak:
how u do this?
[Xiaomi Mi A2 / 6X Questions & Answers] Benjamin_L:
Come on this is off topic. Basic usage of the phone. Display lock etc...
[Xiaomi Mi A2 / 6X Questions & Answers] SirMorokei:
Fingerprint unlock is under Settings > Security & location > Fingerprint

App login must be supported by the app as an example PayPal supports it.

Google Play payment: Google Play > Settings > Fingerprint authentication
[Xiaomi Mi A2 / 6X Questions & Answers] jblanco93:
The point basically is, do you wake up your phone with the fingerprint, or do you just unlock it. There is difference between put your fingerprint from screen off, or first press power button and then unlock it. Just to understand why the bug is not happening for you

Enviado desde mi Mi A2 mediante Tapatalk
[Xiaomi Mi A2 / 6X Questions & Answers] akatsukiclan1:
r10p4, goodix, bugged
[Xiaomi Mi A2 / 6X Questions & Answers] juninhoak:
same here, i will send back tomorrow, i dont want a ****ing phone that i cant use fingerprint reader
[Xiaomi Mi A2 / 6X Questions & Answers] theelle:
I've already send back and I'm waiting a mi a2 lite...
[Xiaomi Mi A2 / 6X Questions & Answers] theelle:
Yes, but with Android stock the difference is minimal... Plus battery, plus sd, plus jack audio...
[Xiaomi Mi A2 / 6X Questions & Answers] iFreeMan:
Hi guys. Seems the issue is not only for Mi 2a. The same about Redmi Note 5. I've created this topic: https://xdaforums.com/redmi-note-5-pro/help/cpu-frequency-lock-maximum-frequency-t3832656

I have these lines about my fingerprint device:

Manufacturer: FPC / Goodix

Model: FPC102x / FP

And I have this bug.

Actually may be the reason is not just fingerprint sensor, because it's just the part of all motherboard connected devices.

But may be we have difference revision of our SoC and that's the reason of bug.

The interesting moment that I hadn't this bug when I've installed Pixel Experience firmware with Android 9 based. But on stock MIUI I have this bug.

Dunno the reason.... I fed up with all that.

The hot solution I've found: ROOT the device and change governor to ondemand. And then I haven't frequencies stuck. Now every week after weekly update I do repeatedly root, and then change governor from interactive to ondemand and then everything works great.

But.. the bug is awful.. pretty awful
[Xiaomi Mi A2 / 6X Questions & Answers] strapabiro:
Any official Xiaomi statement on this bug? How the hell should I explain to the seller this bug and even If they take it back, they send it to service where they make a factory reset and ship it back repeating the same crap over and over till the warranty is done, yes welcome to Eastern EU. (the 30 days no question asked buyback is over). I literally threw out the A1 through the window because of the proximity sensor bug which got fixed after one year on the A2. So I suppose the only retarded person here is me, since I gave another chance for this garbage am I right?
[Xiaomi Mi A2 / 6X Questions & Answers] pack21:
Someone, seller, told me this is a hardware issue, and nothing could be fix by software.

Glade i was able to return my buggy A2.

Enviado do meu POCOPHONE F1 através do Tapatalk
[Xiaomi Mi A2 / 6X Questions & Answers] juninhoak:
Idk If xiaomi Will fix it
[Xiaomi Mi A2 / 6X Questions & Answers] Lurensu:
Yeah I'm saying this all the time for a month now...

Most people on XDA just don't like to read apparently

---------- Post added at 01:18 PM ---------- Previous post was at 01:16 PM ----------

IT IS NOT A HARDWARE ISSUE.

People, can you please read the damn posts on this thread instead of keeping writing random stuff?

Seriously, it's annoying.
[Xiaomi Mi A2 / 6X Questions & Answers] Sift:
Not a hardware issue. Fixed the bug by changing governor and my frequencies don't stuck anymore. I checked for a few times a day and not once they stuck at max. I also use fingerprint reader normally.
[Xiaomi Mi A2 / 6X Questions & Answers] pack21:
No, dont fix it, little cpu stuck at 1440mhz after some time.

Enviado do meu POCOPHONE F1 através do Tapatalk
[Xiaomi Mi A2 / 6X Questions & Answers] strapabiro:
Then for people who don't support rooting, the only option left is to send back the product i guess
[Xiaomi Mi A2 / 6X Questions & Answers] Sift:
What do you mean by some time? A day or two? So far both big and little cpu don't stuck for me.
[Xiaomi Mi A2 / 6X Questions & Answers] SirMorokei:
I tested everything. Wakeup and just unlock. I already posted it a time ago. In short: I don't get the stuck CPU bug with my fingerprint scanner. The bug appears during the runtime and has nothing to do with the fingerprint scanner at all.

---------- Post added at 04:10 PM ---------- Previous post was at 04:08 PM ----------

Or maybe just wait for an update like the October update or an upgrade to Android Pie. Also the CPU drain isn't that huge still better than the overall of flagships I had.

---------- Post added at 04:17 PM ---------- Previous post was at 04:10 PM ----------

I wouldn't trust this. Some people already reporting that even with the 'ondemand' state they have the bug.

The only solution that helped without getting the bug back is to under-clock the CPU.
[Xiaomi Mi A2 / 6X Questions & Answers] e34v8:
On Mi A2, there is no need to change the governor to ondemand. I'm using interactive and it's fine. Just need to set the frequencies manually and that's it.

Do not confuse other people. It's not a hardware bug, because "someone" told you. It's a simple software bug, easily fixed by setting the frequencies manually.
[Xiaomi Mi A2 / 6X Questions & Answers] juninhoak:
But did u Lost performance?
[Xiaomi Mi A2 / 6X Questions & Answers] iFreeMan:
This was helpful for my Redmi Note 5. For a month I haven't stuck kernels on ondemand. But when I restart device and forget to change interactive.. then I have stuck in first 1-2-3-4 hours of work.

So.. I just root my device after each weekly update and change to ondemand and that's temporarily fix for me. I'd prefer do not do that... but, unfortunately.. I have.

Because if not.. my phone warm during the whole time and battery draining really fast.

I mean... when the frequencies is locked, during intensive usage, I have 0% even before 6-8pm. Pity.

But when I change it to ondemand and frequencies is not locking.. I back home at 6-8pm and have 15-30% battery.

Huge difference.
[Xiaomi Mi A2 / 6X Questions & Answers] jblanco93:
Mmm idk what it may really cause it, but as you say it appears during the runtime ONLY if you use the fingerprint to wake up. So you are saying if I'm not wrong that you're still having the bug but not related with the fingerprint

Enviado desde mi Mi A2 mediante Tapatalk
[Xiaomi Mi A2 / 6X Questions & Answers] SirMorokei:
No this is not the case. I often wake up my phone with the power button to see if there are any notifications and than I unlock my phone with the fingerprint scanner. And still get the bug after ~3-6 hours. Even if I don't use my fingerprint scanner at all I get the bug during the runtime of the phone. It doesn't matter if I use the scanner or not. The bug is still present. It's more likely software related than hardware related.
[Xiaomi Mi A2 / 6X Questions & Answers] jblanco93:
Try to disable the fingerprint. I don't hace the bug since then, and I think that no one. What you say, it may be something touch your fingerprint sensor (just a theory) or that it's related with it but not with waking the phone up.

The point is, if you disable the fingerprint, there is no bug at all.

Enviado desde mi Mi A2 mediante Tapatalk
[Xiaomi Mi A2 / 6X Questions & Answers] SirMorokei:
As I already said: I tested everything. Even disable the fingerprint, complete wipe etc.

Bug is still present.
[Xiaomi Mi A2 / 6X Questions & Answers] juninhoak:
O dont have the bug after disable fingerprint, but i want to use the fingerprint
[Xiaomi Mi A2 / 6X Questions & Answers] SirMorokei:
Than you are lucky. But I still have it. I will wait for the December update and hope they will fix it. If not I will go back to my beloved Moto Z2 Play.
[Xiaomi Mi A2 / 6X Questions & Answers] juninhoak:
Why dezember?
[Xiaomi Mi A2 / 6X Questions & Answers] evertonaperes:
Sorry for my English, could you make a document of how you make this change? so I understand you have to root in the device and change a processor configuration to on demand

and then revert to root to receive new updates?
[Xiaomi Mi A2 / 6X Questions & Answers] SirMorokei:
Welp my brain is in November xD I mean I will wait for the October update
[Xiaomi Mi A2 / 6X Questions & Answers] juninhoak:
O Hope they fix that ****
[Xiaomi Mi A2 / 6X Questions & Answers] Ravenlll:
So if took into account all new information:

- bug cannot be fixed by changing kernel (e.g. pixel experience reported to has this bug)

- bug cannot be fixed by changing governor, it's just postpone the appearance

- not only A2 affected by the bug, but also Redmi Note 5 (Pro)

- not only Goodix fingerprint sensor, but FPC also triggers the bug, but in different resulting state (cores BIG at 1401MHz) and much less often

Does somebody knows any other Xiaomi model with Goodix fingerprint with or without this bug?
[Xiaomi Mi A2 / 6X Questions & Answers] jblanco93:
I was replying to that anyway, if you have the bug again it's another topic.

Enviado desde mi Mi A2 mediante Tapatalk
[Xiaomi Mi A2 / 6X Questions & Answers] ojetepicor:
It could be an SW error, but what is certain is that it is triggered by a faulty HW component (Goodix fingerprint).

People from Redmi Note 5 forum with the same fingerprint sensor are reporting the same failure.
[Xiaomi Mi A2 / 6X Questions & Answers] SirMorokei:
If even the users from the note 5 have the problems than it isn't a hardware error.

It's more likely that it is driver related and not hardware related.
[Xiaomi Mi A2 / 6X Questions & Answers] Nebrassy:
Pixel experience doesn't change the kernel, it's a gsi

The only confirmed devices to have the bug are ones with goodix sensor, as almost everyone that reported it has that sensor, if one or a few people say they got it on fpc that really doesn't confirm anything, it can be a mistake with testing or caused by literally anything else

Your software controls your cpu's frequency and as long as the cpu does go down in frequency when you manually ask it to then it's 100% a software issue only, a fingerprint sensor can not control your cpu unless there's software causing this stuff to happen
[Xiaomi Mi A2 / 6X Questions & Answers] ojetepicor:
After read all post i think you're right. People with other FP scanner also reported the issue, so most likely it's driver related.
[Xiaomi Mi A2 / 6X Questions & Answers] pack21:
False, is a hardware issue.

My statement is closer to the truth than yours. The time is passing, the upgrades too and the issue remains.

Who is more right?
[Xiaomi Mi A2 / 6X Questions & Answers] Mixz1890:
Oh god, please learn to write in english... And stop spreading false information. If it was to be a hardware issue then most likely the bug wouldn't go away if you just avoid waking up the phone with FP. It works fine in other situations like google payments or unlocking the phone when it has been waken up already with power button. Pretty much only 1 thing triggers it. Xiaomi or Goodix ****ed up with the drivers probably and thats why it is affecting other devices as well.

Side note: Technically you could fix this problem yourself by buying another fingerprint sensor and changing it to FPC but sadly there is no way to know which is which because sellers on aliexpress or similiar websites don't know what they are selling.
[Xiaomi Mi A2 / 6X Questions & Answers] pack21:
Don't be childish, you understood very well what i wrote, though not entirely correct.

Someone connected to Xiaomi has already admitted to be a hardware issue, it's good that you prepare to truthful.
[Xiaomi Mi A2 / 6X Questions & Answers] Sift:
Hardware issue can't be fixed by software, for example screen bleeding on some Pocophone F1. In this case, Mi A2 which has frequency bug, can be fixed by using third party app, (eg: Kernel Audiutor) although requires you to root.
[Xiaomi Mi A2 / 6X Questions & Answers] Lurensu:
Please man, if you don't understand how this works, just don't post, we would appreciate.
[Xiaomi Mi A2 / 6X Questions & Answers] pack21:
That isn't true, i try everything you said, and the bug always come back.

The A2 is dying, instead of improving the software, it walks around this bug that has no solution.

It's a shame because without the bug, it would be the phone of the year, for the quality/price ratio.
[Xiaomi Mi A2 / 6X Questions & Answers] Lurensu:
Actually if you change the governor or even just the frequency manually after that the issue occured, it never comes back. I'm using this method for more than one month and everything works fine
[Xiaomi Mi A2 / 6X Questions & Answers] Sift:
I'm sorry that it doesn't work for you. But it worked for me, the bug never came back. I wish I can help you more because Mi A2 is a great device if not for the bug.
[Xiaomi Mi A2 / 6X Questions & Answers] juninhoak:
what frequency u put?
[Xiaomi Mi A2 / 6X Questions & Answers] e34v8:
No, there is nothing remotely true about your statement. Just because you say something, it does not make it true.

This is a SOFTWARE issue. It's easily fixed with root and just a simple setting. So if it was a hardware issue, it would not be possible to fix it without a part replacement. Like, for example, the huge amount of light bleed of the pocophone f1 LCD. No fix there.

I could not explain it more clearly, for all the users that are wondering - it's a software bug. I'm using my Mi A2, rooted with manually set frequencies and there is no issue. SoC is not stuck at max.

The only real problem is Xiaomi and their lack of responsibility for supporting the devices they sell.

Edit: screenshot attached for the non believers.
[Xiaomi Mi A2 / 6X Questions & Answers] mugentech:
who, where?
[Xiaomi Mi A2 / 6X Questions & Answers] SirMorokei:
Thank you very much for the clarification.

We just can hope that we will get an update if not the most people are going to return the phone. I would root it but I don't want to unroot/root it everytime a new update is available.
[Xiaomi Mi A2 / 6X Questions & Answers] cchelo:
could you share the settings you used in the Kernel Auditor please?? thanks in advance
[Xiaomi Mi A2 / 6X Questions & Answers] e34v8:
Of course - interactive governor for both cores, 1113MHz minimum frequencie for the big cluster, 902MHz for the little. Using 902MHz is a personal preference, you can use 633MHz if you like. Also disable the cpu boost on all cores.

P.S. If you have any problems, reboot the phone ("set on boot" turned off in kernel audiutor), wait until the cores get stuck, than go into kernel audiutor and set the settings above. You'll get super smooth phone and no stuck cores.
[Xiaomi Mi A2 / 6X Questions & Answers] juninhoak:
doing this you are losing large amount of performance.
[Xiaomi Mi A2 / 6X Questions & Answers] e34v8:
Not really. Actually, the phone feels noticably faster and smoother than stock. Animations and scrolling. And I can guarantee, because I have an ocd about smooth scrolling and performance. But that's my experience, yours may differ.
[Xiaomi Mi A2 / 6X Questions & Answers] cchelo:
thank you very much dude, I will try :good:
[Xiaomi Mi A2 / 6X Questions & Answers] juninhoak:
how is ur SOT with this configuration? and what about the OTA?