After searching extensively on the whole Nexus 6 signal debacle. I've gotten some observations and studies to share and a couple questions.
I recently obtained a Nexus 6, which I already knew had the ! no data connection problem. (I tried to help the previous owner with the issue before, calls/texts would work, but data wouldn't) They were naturally on T-Mobile, so I assume it was related to the project Fi launch. Googling the issue recently states mostly T-Mobile and Sprint users having the issue, so I decided eh can't pass up a good deal! A like-new Nexus 6 for only $70, who can resist? I figured even if I get the no data issue, I can just turn on airplane mode, use as a mini-tab.
Here's where it gets interesting: I use Cricket (which is AT&T of course), popping the sim in results in good signal, LTE, etc as expected. Randomly (sometimes within 2 minutes) instead of the "!" on service problem, it drops to No Service completely. A reboot and it comes back fine, this wouldn't be too much of an issue except it happens EVERY 2-10 minutes. The only way to get it back is a reboot, airplane mode toggle doesn't help.
Which leads into the second part of the conundrum: Airplane mode doesn't help.
I figured I might just keep it in airplane mode and use as a tablet... The phone said no, Was fully charged before going to bed, by morning 17%. In airplane mode no less, which is of course is abnormal. Looking into it, it seems the phone never went into Deep Sleep, which I immediately delved into the cause. At this time I was running CM13 latest nightly, naturally I went for a fresh stock flash... Same issue. I even stock flashed to 5.0.0 and the same issue... Looks like hardware, but the randomness is the confusing part and you'd think if it was hardware a simple reboot wouldn't fix.
The phone never slept because when it would "No service" on me, I'd get wakelocks for "msm_hsic_host" which would keep the phone awake EVEN IN AIRPLANE MODE, which also in the battery settings showed the red bar for "bad" signal. This happens with AND without a sim, airplane mode or not. I'm currently on Pure Nexus and Franco's kernel to disable hsic wakelocks, and I'm seeing another one for "qcril_pre_client_init" when the issue happens. Which would be the Qualcomm radio interface layer, by the name, I'm assuming android is trying to turn on the radio and keeping the phone awake. This shouldn't happen in airplane mode, I've also tried "Toggle Cell Radio 5.0" to directly turn off the cell radio; Issue remains.
The randomness of when it happens, how it's "resolved" by a simple reboot, and the fact that airplane mode has zero effect on when it happens basically cripples it as a tablet as well, it never sleeps so the battery life is pretty crap (about 18%/hour screen off). After a reboot the thing is great as long as the thing has signal, runs cold, great life, charges fast, sleeps deep. Befuddled that it still does it without a sim card and airplane mode...
My question to the users here: If anyone else has any insight on this, and if anyone knows how to completely disable the cellular interface and literally turn it into a tablet. Is there any rom or such that doesn't try to wake/use the cellular radio and keep the thing awake.
EDIT: Yes, I've run the factory images from google, 5.0.0, 6.0, and 6.0.1 during testing.
The sim card is new, I've already changed it.
Yes the device is actually an XT1103, not a knockoff.
Sorry if any of this information wasn't clear enough.
Further Observations:
During the night I had zero reboots (It's setup to reboot on signal loss, so from here reboot == signal loss), then after taking it off of charge and turning the screen off, then back on after about 5 seconds the signal was lost and it rebooted.
This got me thinking, so on the way to work, I streamed music and had zero problems, not on the charger. After reaching work, I moved some offline music onto my phone and it acted fine as well. The phone never reboots if the screen is kept on as well.
This tells me it's something about how android switches to low-power on the cellular radio. Perhaps the radio cannot wake up properly from the low-voltage sleep state.
tl;dr
When phone is 'active' and not sleeping, problem doesn't arise.
Acts normal with screen off: Streaming music, Regular music, Plugged in.
Acts normal with screen on always.
If doing nothing and phone sleeps: reboots, usually on wake up (i.e. turning screen on to check time)
Likely issue with sleeping/low-power to the cellular radio.
Current bad "solution" play music with phone muted.
However, this doesn't seem to be too bad an impact on battery life, music player has used a total of 1% in the last two hours, screen is top again, where it was android os.
EDIT: Went all day without dropping signal by keeping music playing muted. At 52% after about 12 hours, 3 hours screen on, an hour VOIP call, wifi on the entire time. Not the best solution, but it's livable.
Further testing: I've tried a couple "keep awake" apps that set wakelocks and they do not seem to help, but this might be that they are not designed for marshmallow.
I've also "unoptimized" anything related to phone/cellular in the battery settings to prevent doze from sleeping them, no effect, double the apps directly hit the radio.
first off, first thing that I would do is fastboot flash the latest 6.0.1 factory image(then root it). as the issue sounds like a software problem. if it is, this would fix it. if it still is broken, then I'd root it for sure, then disable the cellular connectivity issue with my root access. without root, you are stuck with airplane mode, only.
simms22 said:
first off, first thing that I would do is fastboot flash the latest 6.0.1 factory image(then root it). as the issue sounds like a software problem. if it is, this would fix it. if it still is broken, then I'd root it for sure, then disable the cellular connectivity issue with my root access. without root, you are stuck with airplane mode, only.
Click to expand...
Click to collapse
I mentioned that I stock flashed... I tried 6.0.1 and even 5.0.0... Also I'm on a custom rom + kernel, so I kiiiinda have root access as well. I don't mean to sound uppity or anything, but did you even read my entire post? If you have a way to completely disable the cellular radio, by all means share. Only other thing I can think of to try tomorrow when I get time is to flash an incompatible baseband, but I can see it causing the same issue with I/O problems.
Skreelink said:
I mentioned that I stock flashed... I tried 6.0.1 and even 5.0.0... Also I'm on a custom rom + kernel, so I kiiiinda have root access as well. I don't mean to sound uppity or anything, but did you even read my entire post? If you have a way to completely disable the cellular radio, by all means share. Only other thing I can think of to try tomorrow when I get time is to flash an incompatible baseband, but I can see it causing the same issue with I/O problems.
Click to expand...
Click to collapse
By saying what you did that doesnt say if you went completely stock with the google images or some of the roms floating around. There is something in the background trying to force the device to connect to cell netowork. I would completely erase the device and make sure to format everything with the flash all bat file. You will ose everything on the device.
Also could be a lose connection in the hardware.
zelendel said:
By saying what you did that doesnt say if you went completely stock with the google images or some of the roms floating around. There is something in the background trying to force the device to connect to cell netowork. I would completely erase the device and make sure to format everything with the flash all bat file. You will ose everything on the device.
Also could be a lose connection in the hardware.
Click to expand...
Click to collapse
When I said stock, I meant the factory images from google... I've completely wiped the device several times. I'm not new to the entire process... That's why in my original post I stated possible hardware, but curious as to why it does it even in airplane mode when it shouldn't poll the cell radio at all. Further testing seems to say that disabling location access (I generally use battery saver, gps only for navigation), it holds signal longer. Potentially something wrong with how the system requests location.
Skreelink said:
I mentioned that I stock flashed... I tried 6.0.1 and even 5.0.0... Also I'm on a custom rom + kernel, so I kiiiinda have root access as well. I don't mean to sound uppity or anything, but did you even read my entire post? If you have a way to completely disable the cellular radio, by all means share. Only other thing I can think of to try tomorrow when I get time is to flash an incompatible baseband, but I can see it causing the same issue with I/O problems.
Click to expand...
Click to collapse
like was said, kinda sounded like you flashed a stockish kinda ROM. if not factory image, I recommend it.
Skreelink said:
When I said stock, I meant the factory images from google... I've completely wiped the device several times. I'm not new to the entire process... That's why in my original post I stated possible hardware, but curious as to why it does it even in airplane mode when it shouldn't poll the cell radio at all. Further testing seems to say that disabling location access (I generally use battery saver, gps only for navigation), it holds signal longer. Potentially something wrong with how the system requests location.
Click to expand...
Click to collapse
Are you sure it is a legit device? I have seen some knock offs have this issue.
You know we are all kinda dumb here. Myself included.
Run a logcat and see what is trying to connect.
zelendel said:
Are you sure it is a legit device? I have seen some knock offs have this issue.
You know we are all kinda dumb here. Myself included.
Run a logcat and see what is trying to connect.
Click to expand...
Click to collapse
Yes it is a legit device directly from tmobile. I'll do more testing tomorrow.
Maybe try a new sim card,only thing I can't think of
holeindalip said:
Maybe try a new sim card,only thing I can't think of
Click to expand...
Click to collapse
Already got a new sim, updated info in original post.
Attached a screen with battery info, from testing it's pretty accurate.
After implementing my "solution" for a couple days, it seems to sleep fine now without losing signal. Remember, I have tasker setup to reboot on signal loss so this is informative that it actually sleeps now...
Was the phone ever wet? The signal loss is common on my Nexus, as with my previous, always have missed calls etc, got a voicemail but no missed call notification. However it doesn't really describe the radio issue your describing. I'm almost certain the mother board is malfunctioning. The radio turns to low power mode in doze, but never returns to full power state. Seems to me that it's a communication issue from the motherboard. Neat idea for your "solution".
Sent from my Nexus 6 using Tapatalk
Jnewell05 said:
Was the phone ever wet? The signal loss is common on my Nexus, as with my previous, always have missed calls etc, got a voicemail but no missed call notification. However it doesn't really describe the radio issue your describing. I'm almost certain the mother board is malfunctioning. The radio turns to low power mode in doze, but never returns to full power state. Seems to me that it's a communication issue from the motherboard. Neat idea for your "solution".
Sent from my Nexus 6 using Tapatalk
Click to expand...
Click to collapse
Phone has never been wet or suffered any trauma such as a drop or high temps. It's an odd little thing.
Try flashing a different modem?
dcrews said:
Try flashing a different modem?
Click to expand...
Click to collapse
I have, I think it's a hardware problem where the modem can't wake up from low power state similar to some cpus unable to wake if set too low.
Seemingly a breakthrough
Did a few more things and testing and I seem to have gotten onto something. I've attached screenshots showing just over 3 hours deep sleep and included battery info page. As a recap I couldn't get 10 seconds of deep sleep before tasker would wakeup the phone because it lost signal, then wait 30 seconds before rebooting it to get signal again, unless I was playing music (which kept the phone awake and thus never lost signal). You may notice on the upper left the carrier symbol, I'm on Project Fi and using Signal Spy to show which carrier I'm currently on. After doing my tests today it swaps carriers fine without ever completely dropping the radio and requiring a reboot to regain signal.
I'll do more tests and see how long, if it does to act up. If I seem to have actually found a real solution, I'll post what I did to resolve the issue just incase any other Nexus 6 users are experiencing problems.
Edit: Small note worth mentioning, wifi seems more stable as well. I'm able to keep AndroIRC connected with the screen off whereas I was having issues with it disconnecting randomly. This MAY just be due to something else, but still noting it here.
Hi Guys
Never had a problem with my P9, never had a problem with software.
I am currently on EVA-L09C432B378 software (official Android 7.0) and yesterday, due to the issues with network provider, I thought that phone is playing up (no internet despite 3G icon in notification area) so I have restarted it twice or three times.
After restarts, phone was not getting any phone signal, but that was not because of my phone.
Just the network ("Three") had some issues (found out later on on their Facebook profile).
Anyway - after those restarts, I have noticed that almost all my personal settings are gone and phone is almost like it would be after factory reset. Main ringtone has changed back to the default, notification tone went back to default, notification and status bar all settings went to default, brightness settings, sleep timeout, auto-rotate went off, eye-comfort went off, vibrate when ringing went off, also the Do not disturb is now "Off" and I do have to set things like this again.
The options which did not change are Wifi, Bluetooth (including remembered networks and devices), PIN, smart unlock, fingerprint ID.
Did anyone ever had such a strange thing and do you know if there is a way to backup only the phone settings (even using built in Huawei Backup app)?
Yes i have had this a couple of times - personal prefs change, back to default keyboard, default ringtones and some (but not all) apps need to be logged in again.
Ive recently flashed up to B390 - will see if it behaves itself more!
Make sure you're not logged in as a guest on your device. Settings/Advanced Settings/User Mode
Sent from my EVA-L09 using Tapatalk
I recently bought an MI 9 Lite and I am experiencing a problem with the device daily.
Constantly while in use, the phone simply goes to the lock screen. It happens most of the time when I'm driving with Waze or Google Maps, but it also happened while I was typing a message on Whatsapp with the phone in my hand.
I identified that the situation is occurring when there is a carrier signal failure, but found no explicit setting in the phone menu to lock the screen when the network goes down.
This is hindering the use of the phone and I'm even not using it as a GPS. I've found other people reporting the same situation with this model, but none of them have found a solution yet (https://c.mi.com/thread-2741448-1-0.html).
My phone is running MIUI Global 11.3.4.
Same problem on my mi9 miui 11.0.6
Maybe this bug somehow connected with google smart lock. Cause before i was update my phone from miui 10 i had some problems between smart lock, and always on display. I checked a lot of forums, but noone have no idea why this bug happens. And only on mi9 and miui 11
racastro said:
I recently bought an MI 9 Lite and I am experiencing a problem with the device daily.
Constantly while in use, the phone simply goes to the lock screen. It happens most of the time when I'm driving with Waze or Google Maps, but it also happened while I was typing a message on Whatsapp with the phone in my hand.
I identified that the situation is occurring when there is a carrier signal failure, but found no explicit setting in the phone menu to lock the screen when the network goes down.
This is hindering the use of the phone and I'm even not using it as a GPS. I've found other people reporting the same situation with this model, but none of them have found a solution yet (https://c.mi.com/thread-2741448-1-0.html).
My phone is running MIUI Global 11.3.4.
Click to expand...
Click to collapse
I only saw that when you take out the SIM card, have you tried changing your sim card for a new one?
Hi Guys.
Since I've bought my Mi 9 Lite (nov 2019), I'm experiencing this issue. I tried to update (on 11.0.3.0 Android 10 now), but the only thing that changed is that I have the signal drop and the screen doesn't lock anymore. The signal drops in many situations, but it happens mostly when I try to call someone using whatsapp. I searched a lot, but couldn't find a solution. Someone can help me?
This is very annoying.