New POCO F3 (12.5.6) - loses gps signal / kernel panic


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nahsha

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Aug 25, 2021
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Hi, I've noticed that I'm losing gps signal when using waze/maps! It appears that data/mobile service is crashing in the process resulting in "No Service" being displayed for a few seconds until reception is reestablished.

Can someone look into this issue?

Thanks!
 
+1

I have faced a very similar issue since moving to Xiaomi.EU rom, i can see the quick access button that displays data plan counter to show "SIM card is not installed" for a few seconds until data/service is restored, i can see the bars do NOT go away but it shows "No service" where the provider name would go on the status bar.

For me it seems to work for a few days after a FW update is applied (i.e from 12.5.5 to 12.5.6) until a reboot is made and then the issue returns, during this time i can see the phone does NOT pick up 4G+ Networks so it remains in 4G (or lower) only, the issue seems to be only related to those networks, if i select "Prefer 3G" in mobile settings the issue is not happening.
 
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Noticed the following in logcat, just in case:

IMS_FATAL]| 3730 |qpCheckSockEventsOnNetConnProfiles : pNetConnProfileArray NULL
 
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Here is what i found and did to "fix" my data issue, not sure if its related to the GPS, or simply by losing mobile data the GPS doesnt work just the same, but its quite a simple fix, but you need Magisk (root), and a couple of other apps, Network Signal Guru and LTE Discovery.

In my case i noticed using B66 4.5G (4G+) band caused the mobile data/service to crash, lost for a few seconds, you need to lock that band out, that solved it for me.

https://c.mi.com/thread-3018482-1-0.html
 
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My modem crash issue was related to 1900 mhz 3G band. Disabling it seems to have fixed it for now.
 
I spoke too soon. It isn't fixed, even when disabling the band in question. I'm on 13.0.3.
 
This doesn't fix it for me. I still get the kernel panic. I don't understand why isn't Xiaomi putting priority on this when clearly multiple users are affected.

Some more references:

forum.xda-developers.com

Random reboots while using LTE in AOSP roms

i have been using many aosp rom AND in all of them I have experienced random reboots while using LTE but I don't understand what causes it. Does anyone know what causes this bug?
forum.xda-developers.com forum.xda-developers.com
forum.xda-developers.com

Poco F3 mobile data and wifi drop randomly

Hi, I have a brand new Poco F3 6GB/128GB running on MIUI 12.5.6.0 Global Stable, and sometimes wifi and/or mobile data drop randomly. I was just walking home about 30 minutes ago while playing Clash Royale on mobile data, had full signal bar and...
forum.xda-developers.com forum.xda-developers.com

I'm on 13.0.3
 
Hi @Igor Eisberg

Is it possible for someone from the dev team to look into this issue? I've also reported it using the feedback app, but Xiaomi hasn't even acknowledged it.. pretty frustrating.

Thanks.
 
nahsha said:
Hi @Igor Eisberg

Is it possible for someone from the dev team to look into this issue? I've also reported it using the feedback app, but Xiaomi hasn't even acknowledged it.. pretty frustrating.

Thanks.
Click to expand...
There's nothing we can do when it comes to signal/modem issues, it's part of the firmware which can't be modified.
 
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