Develop Bugs

Don't let your phone sleep while downloading a big APP via WIFI

This issue has happend 2 times. It used my 3G data over 90MB for APP downloading!
As you know, the phone won't allow you to download a big APP without wifi or pc connection by design.
Yesterday I downloaded the trial version of Need for Speed(about 127MB) from marketplace and turned on WIFI before that. I just checked the detailed list of my 3G usage yesterday. In that time it downloaded 90MB+ from 3G network in 20 minutes.
I guess the phone turned off the wifi in sleep mode and continue downloading the APP through 3G.
It should be a bug!

Yes, it is a known issue that WP7 turns off wi-fi when phone goes into sleep. To work around this issue, you need to keep the phone plugged in.
Modern wi-fi chips in phones drain less battery juice when you leave it on all the time than constantly off-on-off. Also, it does not necessary use more battery downloading via wi-fi than 3G. I guess MS didn't get that notice when implementing WP7
We can only hope this is addressed in upcoming NoDo update.

Pretty sure this feature isn't designed like this to save battery while connected to a wifi network, I'm sure it's implemented with this design to save battery while you AREN'T in range of one of your networks, rather than having the wireless chip constantly poll for networks...

As someone else said, just plug your phone into the power outlet and wifi will always stay on.

[Q] How to totally disable Cellular network ?

I have N7 LTE 4G and most of the time I use it with Wi-Fi only. Yesterday I decided to get a pre-paid Sim to use for Data only when I am in a place that doesn't have Wi-Fi with 1GB per month data for $2.90 (yes it is THAT cheap in Egypt ) but only 3G/HSDPA/HSPA+
Now the problem is, Cellular network is always running and battery drains fast even though I use the internet on Wi-Fi and turned Mobile Data off.
I've read that I can turn on 2G to save battery and disable the cellular signal and indeed when I check 2G, I get no bars in cellular top icon and it says No Service (Network Name) BUT..... as soon as I open internet browser or any internet app, the cellular network works again by itself although 2G is still checked !!
Is this some kind of bug ?
The only solution I can do is to turn on Airplane Mode and turn Wi-Fi on afterwards which is not ideal
Any help would be much appreciated.

There is an app called Battery Monitor Widget that has "Tests" tab when I press on it, it opens "Testing" page in which the first option is Tablet Info. There is a list called "GSM Only" in which there is a toggle to Turn Off Radio and indeed it turns it off

I use airplane mode then just turn wifi back on to keep the cellular radio off.
Sent from my Nexus 7 using XDA Premium HD app

Que_Ball said:
I use airplane mode then just turn wifi back on to keep the cellular radio off.
Sent from my Nexus 7 using XDA Premium HD app
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How much battery does this save ?

r9800pro said:
How much battery does this save ?
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It really depends on your signal strength. If you have strong signal you shouldn't see a huge difference. If you have a weak signal then it could be a big boost to your battery life.
And I'm not sure why you said that it was "not ideal" in your initial post. That's really the best way to go about it.

raptir said:
It really depends on your signal strength. If you have strong signal you shouldn't see a huge difference. If you have a weak signal then it could be a big boost to your battery life.
And I'm not sure why you said that it was "not ideal" in your initial post. That's really the best way to go about it.
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Signal is always good but I don't even need it to be there when I am on Wi-Fi as the tablet has no GSM phone functionality.
I think there is something wrong elsewhere with the battery draining so fast other than the GSM Radio being On.
The battery was good and lasted 2 full days with moderate usage and Wi-Fi always On but it started draining fast when I left the tablet untill it totally discharged and woke up to find it powered off and then charged it till 100% and battery reached 55% in 10 hours with very light usage

It sounds like you have an app draining your battery in the background. Try installing Better Battery Stats and see what's using all your power.

raptir said:
It sounds like you have an app draining your battery in the background. Try installing Better Battery Stats and see what's using all your power.
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Is that the $2.76 app from Play store ?

r9800pro said:
Is that the $2.76 app from Play store ?
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Yes, the developer also posts it here on XDA.
http://forum.xda-developers.com/showthread.php?t=1179809

Mobile data not working after Nougat update

Unlocked non rooted phone updated to Nougat running 4.28.401.3 and the last 2-3 weeks my mobile data does not appear to be working most of the time. I get full signal of 4G on EE, have tried changing my APN settings, turning phone/data on/off, used the debug menu to change to LTE/WCDMA only and still have serious issues attempting to connect.
Eventually it starts working but then the connection dies at random intervals.
Wi-Fi is the only thing that appears to be working reliably but that's no good when out and about.
I read about the battery saver bug and have even turned off battery saver and forced apps to not use battery optimization and it doesn't fix the issue. This phone has been flawless for the last 2 years excepting having to replace the battery 2 months ago. Have seriously considered ditching this phone now for a HTC 10 or wait for the upcoming U 'Ocean'.
Has anyone else had this issue?

I have seen another thread with this issue but i dont know if it got fixed.
The best option is to call your carrier as they know what technology they use.
Beamed in by telepathy.

Oreo 8.0/8.1 WiFi battery drain overnight

Hello guys. I suppose I'm not alone in this. My phone losses over 20% every night when connected to wifi network. I tested with wifi off and mobile data (4g) on, and it losses only 4%. Drain is not caused by any apps on my phone, and my wakelocks are ok(tested by GSam Battery Monitor and Wakelok detector). Phone does go into Dose mode overnight. After long period of testing and searching internet I did full wipe data/cache and install stock rom from oneplus site, and install just a few apps from playstore. It was disappointing when wifi drain continued after all I did. Also, when I turn on airplane mode, phone losses 2% overnight, so my conclusion is that wifi causes drain. If you guys have some advice for me, it would be helpful. Thank you!

Same issue here. I have tried everything (clean installs... Formatting data... Multiple roms and firmwares etc)
This is with scanning off and location off. It's Oreo related for sure as the issue dissappears when I flash Nougat

Xcal15 said:
Same issue here. I have tried everything (clean installs... Formatting data... Multiple roms and firmwares etc)
This is with scanning off and location off. It's Oreo related for sure as the issue dissappears when I flash Nougat
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I hope there will be software update soon to handle this problem.

Hi
I have the Same issue on my Huawei p20 lite with Android 8.0. I think it's definitely the software

I noticed that the Wifi drain only appears if there are many wifi networks around.
At home we have 3 networks around and my phone doesnt lose any battery over night.
At my girlfriends place there are like 25 networks around and my phone loses >20% overnight.
Realy strange.
Maybe it has something to do with wifi scanning in the background?

gamer850 said:
I noticed that the Wifi drain only appears if there are many wifi networks around.
At home we have 3 networks around and my phone doesnt lose any battery over night.
At my girlfriends place there are like 25 networks around and my phone loses >20% overnight.
Realy strange.
Maybe it has something to do with wifi scanning in the background?
Click to expand...
Click to collapse
Nah.. Think it's the wifi configuration on the router. When I switched ISPs, I was given a new router and the drain disappeared.
There have always been 4 wifi networks that show up on my devices.

Bad idle power consumption

I am using my new G7 Play with a Mint Mobile SIM (T-Mobile MVNO). I am seeing much worse battery performance than my G4 Play on T-Mobile prepaid SIM, even though its battery is several years old now. I tested the Mint SIM for half a day in the old phone, before I punched it down from micro to nano SIM size. I didn't notice any significantly different battery consumption during that time, but I didn't try to carefully test for an entire discharge cycle.
I have tried to configure them the same way, with the same basic apps and battery optimization settings. For reference, the G4 Play can last 5+ days with my light usage patterns. The G7 Play seems like it cannot even last for 1.5 days. The battery ran down over 25% overnight. In the same time period, my G4 Play only showed a 2% drop.
This is with WiFi on and in range for most of the hours in the day (at work or at home). Signed into GMail, Hangouts, and Slack. Location toggled off. Bluetooth toggled off. And OSMAnd+ installed from f-droid. One difference is that I am still using the default Moto launcher on the G7 Play. I replaced it with Nova Launcher on the G4 Play in order to get rid of the annoying Google search/assistant widget that was not removable in the Nougat update. Both have Moto Display and Moto Actions active, but all the gesture/camera actions are turned off. It just has the notification peeking and active display when you bump or pick up the locked phone.
I have disabled Google Music, Movies, News, and Drive to try to match the config on the G4 Play. I also am not logged in with Chrome nor Photos but those apps are not disabled. I am still searching the Android 9 settings menus, but I don't see any more things I can adjust for efficiency. The battery usage details does not seem to tell me why it is going down so fast.
I am not sure what else to try, except to blindly experiment with disabling other built-in apps/services. There seem to be many more in the G7 Play than on the G4 Play, but I don't want to accidentally cripple the phone. Another possible difference is the G7 Play is using the 5 GHz WiFi channels instead of only the 2 GHz channels. But would that explain such a difference in power draw?

Same problem here, single sim G7 play on t mobile. Tried running in safe mode for a few hours and the drain is the same. The issue seems to be running wifi and cellular radio at the same time. Wifi signal is strong, on 5 GHz. Running only on cellular reduces the drain significantly, even with my crappy -112 dbm signal. I am guessing this is some sort of bug - on a related note, if I turn on airplane mode, and then turn on wifi, the cellular radio also turns on, and cannot be turned off via *#*#4636#*#* diagnostics screen.
Current build is PPY29.105-36

Strange. I put my phone in airplane mode and then turned WiFi back on. It indicated that cellular data was off and showed no phone network status. I then turned on WiFi calling and it showed that I was on T-Mobile WiFi Calling in the lock screen status. I left it idle like this for 20 hours and the battery discharged from 100% to 93%. Today, I will try the opposite, turning off airplane mode and WiFi and using just the cellular network.
Before this test, I did play store updates, rebooted, and then fully charged the phone. There were updates to Phone and Google apps right before I rebooted. My Phone app is at version 31.0.241960258 and my Google app is at version 9.51.10.21.arm. My phone is on US Retail channel and build PPY29.105-36.

Did your cellular radio stay off the whole time? Mine will toggle back on right before my eyes. My google app is at version 9.51.8.21.arm, phone app is the same as yours.

It stays off. I'm only looking at the toggles in the pull-down status menu at the top of the phone screen. I also have bluetooth and location toggled off. Maybe you should try changing some of the location/background scanning options? I turned off those sorts of things when I first got the phone.
Yesterday, I rebooted, recharged, and tested the phone for about 8 hours w/o WiFi, but with phone and data service on. It used a lot more power than WiFi-only from the previous day. It was projecting about 2 days left when I interrupted the test.
Then, I toggled off cellular data service. For the next 9 hours, the power consumption graph flattened out a bit. It's down to 85% now bit it is projecting 3 days left instead of 2.

Ok, figured out the cellular radio turning back on, it was having wifi calling enabled, which doesn't seem to make sense, but I digress.
So you turned on wifi calling, and the power draw was still low? Can you check your cellular radio status with the wifi radio and wifi calling on with the *#*#4636#*#* diagnostics screen?

If I remember, I rebooted with wifi calling off, put it into airplane mode, turned wifi back on, then thought to enable wifi calling. It definitely did not show the cell antenna signal icon in status, and showed "T-Mobile WiFi Calling" in the lock screen. I tested it by calling the number from another phone, and it did ring.
Today, I have continued using the phone with cell modem on for calls and wifi on for internet (but cellular data toggled off and wifi calling still disabled since before last reboot). It is now down to 79% power after 25 hours of operation and predicting 4 more days at this rate. This is more like I expected originally, and not so far off from my old G4 Play.
I am pretty confused by the terrible behavior in the beginning. It may have something to do with booting up with WiFi calling enabled. Or it might be some other strange state that cleared after a few reboots?
If I remember, I'll try to put it back in the wifi-only mode next time I am back on my home network to check that status screen you mentioned. But, I am nearly sure it is going to indicate cellular modem OFF and wifi ON using 5 GHz band.

The phone info screen behind that dial code shows this regardless of whether I am in airplane mode or not: Voice Service: In Service; Mobile radio power: on; VoLTE Provisioned: on; Video Calling Provisioned: on; Wifi Calling Provisioned: on. Because of the differences in other fields and in power usage, I don't believe the indicator about radio power means anything here. The Settings->Phone Info->SIM status screen says "Mobile network state: Disconnected" and "Service status: Voice In Service/Data In Service" when I am in airplane mode w/ wifi calling active.
From the 4636 code phone info screen, these fields change:
- Airplane mode w/ wifi calling active: Signal Strength: -1 dBm 99 asu; Data Service: Disconnected; Voice Network Type: Unknown; Data Network Type: IWLAN.
- Cell on w/ wifi calling active: Signal Strength: -112 dBm 28 asu; Data Service: Disconnected; Voice Network Type: LTE; Data Network Type: IWLAN.
- Cell on w/ wifi calling disabled but wifi on: Signal Strength: -113 dBm 27 asu; Data Service: Disconnected; Voice Network Type: LTE; Data Network Type: LTE.
- Cell on w/ data on and wifi off: Signal Strengh: -110 dBm 24 asu; Data Service: Connected; Voice Network Type: LTE; Data Network Type: LTE.
And the IMS status screen further down under the three-dot menu changes:
- Airplane mode w/ wifi calling active: Voice over LTE: Unavailable; Voice over WiFi: Available.
- Cell on w/ wifi calling active: same as previous.
- Cell on w/ wifi calling disabled but wifi on: Voice over LTE: Available; Voice over WiFi: Unavailable.
- Cell on w/ data on and wifi off: same as previous.
It's only in the 4th config that I actually see "LTE" on the network signal icon in the phone status bar on the home screen.
I should also note that I set the wifi calling settings to wifi preferred/wifi for both choices.

Thanks for all of the troubleshooting info.
I guess this shoots down my simply both radios on theory. You still get bad drain when wifi and cell data are both on?

I gave it about 18 hours to find out. But no, it now seems to have little effect to turn on cell data and wifi together. The phone is continuing to have a pretty good standby power drain with WiFi, cell voice, and cell data turned on.
I'm down to 52% battery and it has been 3 days it was last charged. The power graph shows nearly the same slope over the last couple days whether I turned cell functions on or off. Where there were dips, I think it may be partly that I took the phone away from WiFi, so it started actually using LTE data, and also that I had the screen on some around those times to look at settings and respond to some texts etc.
I'll keep playing with it for a while, but I am also running out of ideas. What's frustrating is that the battery consumption info listed just cellular standby as the originall high power use, not some other app or OS function that would be easier to explain as software-caused.
Just about the only settings I have left to re-test are WiFi calling (with cell modem on), Bluetooth, and Location. I suspect that the location was on constantly in the first day because I wasn't used to the Pie status bar. In my G4P running Nougat, the location icon would be visible in the status bar whenever it is on. But on the G7P, it doesn't seem to indicate anything unless you open the drawer and look at its toggle state.

I worked my way all the way back to having everything toggled on... cell voice, cell data, wifi, wifi calling, and location. It dropped from 100% to 96% in 12 hours overnight, and estimates 10 days remaining. This is far different than the 20-25% drop I saw in the first days.
The only explanations I can think of for this whole experience so far:
1. The power use was due to application behaviour, but the usage details screens were not assigning blame correctly.
2. The battery charge estimates themselves were wildly incorrect in the first days.
3. The phone is configured to waste power out of the box, and has to "learn" to conserve power when idle.
So, the phone seems to do quite well now. I just hope it doesn't decide to switch back to its high consumption mode when I am depending on its battery to endure like it is right now...

lightuser said:
2. The battery charge estimates themselves were wildly incorrect in the first days.
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We know that would be an issue for sure, but the question is whether that's the only issue. I'm hoping it is.