Develop Bugs

Android System eating the battery

Hey all, I don't know if anyone has even noticed on their Evo's but on mine, the Android system usually eats most of the battery. I noticed there is a ton of processes under Android system that are running compared to like five on my Hero. I've never seen the core system processes take up more than maybe 15% of the battery, but right now, I'm at like 41% with 16m 6s of CPU total and 47s of CPU foreground. If anyone knows why this is or a way to fix it, please let me know. I'm on the first MR update. I've been able to get a lot of battery stuff figured out, if I can get the system to calm down, then I should be able to get even better battery life than my Hero.

I'm seeing the same thing, android system is at 96% battery use after letting the phone sit overnight. Never saw that on my nexus, this is strange.
Could be related to the fact that everything is syncing up, I just activated last night too.
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Yeah, the system seems to have calmed down a bit today, though I also have the OC widget running to keep the processor lower during sleep. I'm guessing its helping, but I'm not sure if there is something else to get it down. I almost never even saw the System show up in usage on my Hero, now its one of the top contributers. I got used to having custom roms on the Hero, but so far all I need on the Evo is unrevoked. I know a lot of people around here don't like it, but I found I only needed a couple of apps that require root and so far love it. That OC widget really comes in handy.

maybe i can clear things up a little bit for you guys...what you see in the battery use section is distributed across 100% of the time since you last had it plugged in. if you notice all the percentage numbers add up to 100%.
if you plug your phone in and turn it on and off on you will see that android system is probably around the 90's thats because android system has used 90+ percent of the phone since you plugged it in....over time that number will lower, becuase other things will start using the battery power... what you see is a percentage based on time. not based on whats actually working RIGHT THEN AND THERE do you guys understand?

I too am having that problem and at 15% battery life warning - it still shows my Android system @ 40-44% usage after 8hrs of work.
I mostly text message all day long due to work - make phone calls and recieve calls from work every hour. GPS on for no more than 15min all day long to get direction when my keymap book doesnt help.
4g off, bluetooth off, background data 15 min only (gps) than off, gps off when not in use, mobile network (3g) off when not in use.
I would have figured my screen being on would have drained my battery life since I check text message every 10-15mins for 8hrs...
So went to work at 9am, 100% life
got off work 6pm, 25% life
I've done all the tricks, cdma only, force stopped a bunch of apps, goggle talk off, sync off, making sure maps/gps has been closed (forced or not)
still disappointed with battery life.
Unrooted Evo
My crappy AT&T Razr lasts me 2-3days with text message + call + 1.5hr of playing Bejeweled a day

*facepalm* you guys don't get it....

grrgrrgrr said:
I too am having that problem and at 15% battery life warning - it still shows my Android system @ 40-44% usage after 8hrs of work.
I mostly text message all day long due to work - make phone calls and recieve calls from work every hour. GPS on for no more than 15min all day long to get direction when my keymap book doesnt help.
4g off, bluetooth off, background data 15 min only (gps) than off, gps off when not in use, mobile network (3g) off when not in use.
I would have figured my screen being on would have drained my battery life since I check text message every 10-15mins for 8hrs...
So went to work at 9am, 100% life
got off work 6pm, 25% life
I've done all the tricks, cdma only, force stopped a bunch of apps, goggle talk off, sync off, making sure maps/gps has been closed (forced or not)
still disappointed with battery life.
Unrooted Evo
My crappy AT&T Razr lasts me 2-3days with text message + call + 1.5hr of playing Bejeweled a day
Click to expand...
Click to collapse
check your hardware version there is a thread about different types of evos and it seems like everyone who has the hardware revision 0001 has really bad battery life. i would exchange your device.

Yes we know, Freelancerx, or at least I do. But after over 8 hours and the system is still using more of the battery than anything else is a little disturbing. Never seen that on any other device. I have Hardware 0002.

I have this same issue with hardware version 0002. I run Fresh 1.0.1, i use Netarchy-toastmod kernal, have latest radio. I have also tried Damage Control (did get slightly better battery life out of DC but not amazingly different)
after 7 hrs since unplugged my andriod system is at 39%, cell standby 28% phone idle 20% display 9%.
i dont have bluetooth, wifi or 4g on. I use juicedefender+ultimate to turn off apn when screen is not on. I use set CPU to underclock when i am unplugged and go down to 128 when screen off and i am Stilll lucky if i make it all day with moderate usage.
Every day it is the same andrioid system is around 40% of the usage for the time it was unpluged.
the following is listed under included packages (not sure if this shows the same for everyone or if it shows what packages are running)
BRCMBluetoothService - Bluetooth is not on so if it shows packages running this may be an issue
Sync Feeds - I have all android syncs off and mail at 6 hours
settings storage
Rosie Utility
Acounts & syync
Account and sync settings
settings
HTC Widget Download Manager
Network Location
Setup
HTC Checkin service
Checkin serivce
VPN services
Android system
Wonder if there is something to the android system on these (ie something not turning off that should) or if we are all just crazy and happen to get the same results.

I had a hardware 0002 model and often experienced the same thing with high system % usage.
My phone was replaced, due to a screen issue, and now I have the 0003 model and seems system % is much lower so far.
I haven't installed any system update yet, so I am on the first original release rom (not rooted yet).
Going to be testing it for a few days before I update and root, so I can make a fair comparison between the original and current oem's.

If your phone is on....Android system is being used.

satch12 said:
If your phone is on....Android system is being used.
Click to expand...
Click to collapse
I think everyone here understands this. the question i think we are trying to figure out is why with similar usage and configurations some people get 40-60% android systems usage while others get 10% over the same period of time.

Android system is way too high.
satch12 said:
If your phone is on....Android system is being used.
Click to expand...
Click to collapse
Yes but if it is configured in an optimal way then android system is always beneath cell standby and phone idle.
For example, today after 15h 28m 23s since unplugged I have...
Cell stanby 38%
Phone idle 37%
Android System.....12%
That is with background processing with auto syncing every hour or so.

[Q] Questions about CyanogenMod, and general battery life

Hey everyone, last weekend I unrooted and wiped my phone, went back to factory settings, rerooted and installed CM6.1 RC2. I've been enjoying it so far (because I hate Sense UI) but I've got a couple of questions that need answered. Hopefully you all can help me.
CM6
1. Is there a setting to turn off always-on mobile data? I cannot find it.
2. For some odd reason, I cannot turn on bluetooth. I've not had a problem with turning on bluetooth with any other rom. In fact, I remember testing bluetooth the night I installed CM6. Is this an issue with the phone or the rom?
3. No matter how much I turn off Auto-Sync, it turns back on. What is doing this?
Battery Life
1. On average, I get around 10-14 hours battery life a day, maybe a little more if I barely use my phone all day. I've heard a lot of people say that an ideal battery drain with the screen off should be 1-2%/hour, but mine will drain from 6% to even 10% in 40-50 minutes (EDIT: Currently 75% battery left, unplugged for 2hrs 30min, done nothing but use the browser for 5 minutes, download something, and install it)! I use systempanel and spareparts to monitor which apps could possibly be doing this, but none look like they're eating up too much of the battery. I check Facebook 4-5 times a day, use the browser, and check Gmail. I don't use Google Talk. My screen brightness is around 30-40% and I have underclocked when the screen is off with setcpu. What is draining my battery so fast? It's a shame that there are so many cool things to do with this phone but I can't do them in fear of my battery dying before the end of the day
Sorry, that last question was long, but I did not want 2 separate posts. Thanks guys, I hope you can help!

CarterF said:
Hey everyone, last weekend I unrooted and wiped my phone, went back to factory settings, rerooted and installed CM6.1 RC2. I've been enjoying it so far (because I hate Sense UI) but I've got a couple of questions that need answered. Hopefully you all can help me.
CM6
1. Is there a setting to turn off always-on mobile data? I cannot find it.
2. For some odd reason, I cannot turn on bluetooth. I've not had a problem with turning on bluetooth with any other rom. In fact, I remember testing bluetooth the night I installed CM6. Is this an issue with the phone or the rom?
3. No matter how much I turn off Auto-Sync, it turns back on. What is doing this?
Battery Life
1. On average, I get around 10-14 hours battery life a day, maybe a little more if I barely use my phone all day. I've heard a lot of people say that an ideal battery drain with the screen off should be 1-2%/hour, but mine will drain from 6% to even 10% in 40-50 minutes! I use systempanel and spareparts to monitor which apps could possibly be doing this, but none look like they're eating up too much of the battery. I check Facebook 4-5 times a day, use the browser, and check Gmail. I don't use Google Talk. My screen brightness is around 30-40% and I have underclocked when the screen is off with setcpu. What is draining my battery so fast? It's a shame that there are so many cool things to do with this phone but I can't do them in fear of my battery dying before the end of the day
Sorry, that last question was long, but I did not want 2 separate posts. Thanks guys, I hope you can help!
Click to expand...
Click to collapse
1. no. you could however turn data roaming off or use a program to accomplish this such as "tasker"
2. what do you mean you cant turn it on? what does it do when you enable it? use the widget in your notification drop down.
3. turn off background data as well and that should fix your problem.
and as for you other question. 10-14hrs is perfectly normal for battery life on cm6.1. and fyi: its RC1. there is no RC2 for 6.1 as of yet

t3project said:
1. no. you could however turn data roaming off or use a program to accomplish this such as "tasker"
2. what do you mean you cant turn it on? what does it do when you enable it? use the widget in your notification drop down.
3. turn off background data as well and that should fix your problem.
and as for you other question. 10-14hrs is perfectly normal for battery life on cm6.1. and fyi: its RC1. there is no RC2 for 6.1 as of yet
Click to expand...
Click to collapse
Ah thanks for correcting my mistake, and answering my questions. My battery life isn't terrible per se, but I guess I was asking more on how I could make it better (and if I had a rogue app/other battery eater), especially because I see people claiming anywhere from 20-40 hours with a few tweaks.
And regarding the bluetooth issue, it just won't turn on. The option grays out for a few seconds like it usually does when it's initializing, and then it doesn't turn on. The notification widget method does not work either.
Also, there's no other way to turn off auto-sync? I just think it would be a hassle having to turn background data back on everytime I want to use the market. I use JuiceDefender, too, could there possibly be a conflict between the app and my phone's settings?

Man i'm with you here, I use CM6.1 too and love it but the first 30 minutes i unplug the phone from charging i'm already at like 90% battery =/

CarterF said:
Ah thanks for correcting my mistake, and answering my questions. My battery life isn't terrible per se, but I guess I was asking more on how I could make it better (and if I had a rogue app/other battery eater), especially because I see people claiming anywhere from 20-40 hours with a few tweaks.
And regarding the bluetooth issue, it just won't turn on. The option grays out for a few seconds like it usually does when it's initializing, and then it doesn't turn on. The notification widget method does not work either.
Also, there's no other way to turn off auto-sync? I just think it would be a hassle having to turn background data back on everytime I want to use the market. I use JuiceDefender, too, could there possibly be a conflict between the app and my phone's settings?
Click to expand...
Click to collapse
I had the same problem with my Bluetooth recently. When I try to search for devices the phone locks up and I have to pull the battery. Wonder if this is a kernel issue. I am on snap
Sent from my PC36100 using XDA App

michaelvibe said:
I had the same problem with my Bluetooth recently. When I try to search for devices the phone locks up and I have to pull the battery. Wonder if this is a kernel issue. I am on snap
Sent from my PC36100 using XDA App
Click to expand...
Click to collapse
Yep, I'm on Snap too; must be it.

Another thing; I've got a friend on Stock 2.2 Sense (battery sucking widgets filling the home screen, etc) with 100% brightness and mobile data constantly on and he gets better battery life than me (20+ hours!) What is going on!?!?!

CarterF said:
Another thing; I've got a friend on Stock 2.2 Sense (battery sucking widgets filling the home screen, etc) with 100% brightness and mobile data constantly on and he gets better battery life than me (20+ hours!) What is going on!?!?!
Click to expand...
Click to collapse
never heard of such a thing on stock......

Klk450 said:
never heard of such a thing on stock......
Click to expand...
Click to collapse
I couldn't believe it either, he had 3G on all day and everything and we barely get any signal at all in class. On for almost 8hrs with more than 70% left. I was at about 53%

stock 2.1 idle drain

So...I'm using 2.1 and for some reason when I'm not even using the phoone..the battery drain is ridiculous. Since I'm new to 2.1, does anyone know what is causing this? Any processes I need to end? Any thing I need to remove?
I'm straight up rooted stock 2.1. No custom roms, just a custom kernel. I only downloaded Pandora, Wordfeud and SetCPU.
Edit: I also wanna add that I leave on 4G as well and I see it idle out and when I turn it off and leave it off I still experience the same amount of drain so I dont think its 4G.
And for more details on the drain...I went to sleep for about 3 hours and during that time I went from 91 to 42.
Edit2: Im gonna actually see if maybe it was just the kernel...I was using the first version of a kernel, not its latest version so Im going to put on the latest. But still, Id liike to know if it was a common problem and how most people fixed it.

Kill the omadrm process with each phone reboot. (Forgot exact name, but that is close) If you aren't always in a 4g area, having that radio always on will drain the battery.
Sent from my SPH-D700 using XDA App
Edit: Also double check your phone standby time and see what percentage your Time Without Signal (TWS) is at. Toggle Airplane mode after each reboot will correct that bug.

Also fyi you can use Tasker to toggle airplane mode for you automatically every boot
Sent from my SPH-D700 using Tapatalk

Type this into your dialer:
*#4636*1111#
Click battery history, then click where it says Other usage, change to Partial wake usage, this should tell you what is using your battery while its asleep.
Sent from my non-rooted, stock eclair Epic.

It you can just.install spare parts and.look. also check your time without signal. If you don't reset your radio its prolly 50%. Whether.that is.cosmetic or actually does cause a battery drain its still good to do.
zanderman112 said:
Type this into your dialer:
*#4636*1111#
Click battery history, then click where it says Other usage, change to Partial wake usage, this should tell you what is using your battery while its asleep.
Sent from my non-rooted, stock eclair Epic.
Click to expand...
Click to collapse
Sent from my Evo Killer!!!

Battery life even with removing a few apps is pretty bad.
I think the most I got after a week of tests was about 18 hours and that was with almost no use.
Try downloading JuiceDefender from the market. It's free. What it does really is enable/disable your 3G/4G/WiFi connection when your phone is not in use. It also enables it every 15 minutes (default setting) to get email other updates such as weather. I am not kidding when I say went from an 18 hours to 72 hours hours. Granted, that was with little use.
Can download JuicePlotter as well to get an idea of how your battery is dropping and holding.
Side note that WordFeud constantly runs in the background, so that WILL rape your battery. JuiceDefender will keep it in check. Best app I ever got.
For reference, under 2.1 with JuiceDefender I would lose only about 1%/hour at night when I was sleeping.
Under 2.2 it's more like 2% per hour >.> and I've yet to figure out what's draining it.

I thought I'd chime in since the OP mentioned Pandora. After installing Pandora I noticed my battery drain had gotten significantly worse even when properly quitting out of the app. After uninstalling Pandora battery drain has normalized to the way it was before.

Also, setting your network to sprint only helps with battery too.

jdelano said:
Also, setting your network to sprint only helps with battery too.
Click to expand...
Click to collapse
maybe where you live it does, but thats an awful idea if you are in a town with little service because it will spend more time searching for service because it can't roam (i live in the middle of nowhere in new hampshire).
instead try to update your PRL. download the SDX stock app removal apk. remove the drm crap. and reboot. then charge your phone all the way, reboot into cwm, and reset your battery stats. then let the battery drain all the way and recharge. that should improve it significantly. thats what i did and it worked pretty damn well. battery life is upwards of 36 hours nominal charge now. and my phone used to drain battery WHILE i was charging it if i used it at all. and that was with a 1 Amp charger. also dont let your battery overcharge, mine seems to drain easier when i leave it plugged in all night.

[Q] Cell Standby/Phone Idle battery woes

The battery on my Evo has been plummeting recently. A while ago I could make 36 hours easy, and now I am lucky to get 12. The reason it seems is cell standby/phone idle, according to battery info. Over the course of last night I went from 85% to 28% while I just slept, and according to battery info these two things are responsible for that.
I'm not sure what they are or how to decrease, however. I read that NV and PRI 1.90 was causing problems for a lot of people so I tried downgrading to 1.77 as suggested, but I have no idea where to find the information to see if I successfully downgraded. I am running CM7 nightly build 23, I have wiped battery stats once and I am currently waiting for the phone to die before charging it again, but this has been going on for quite a few days over numerous roms and battery wipes. If I put my phone into airplane mode, the battery is hardly touched overnight. During the day I need my phone on however and the battery drains just as fast, whether I am using it or not.
Any suggestions?
ps. under accounts and sync the only thing I have set to sync is email by push, I receive only a few emails a day and a couple at night so I don't think that would be the problem. Facebook is also set to sync contacts, but only find status updates and the like when I refresh manually. Twitter, and my google account in there but both of those are set to sync manually.

Have you checked your partial wake lock in spare parts?

teh roxxorz said:
Have you checked your partial wake lock in spare parts?
Click to expand...
Click to collapse
I have never used spare parts in my life so bear with me; but when opening it now all I see is device info including battery history, battery info and usage stats, and general options which all have to do with animations, font size, haptic feedback, or compatability mode. I don't see anything that talks about wake lock in here

You click battery history, then on the first tab, click partial wake lock, and on the second, you can click since last boot.

teh roxxorz said:
You click battery history, then on the first tab, click partial wake lock, and on the second, you can click since last boot.
Click to expand...
Click to collapse
thanks! under partial wake usage since last boot, it's hardly nothing.
Android system is by far the winner with almost 11 minutes of usage, email is next at just under 2 minutes, facebook at about 1.5 minutes, and a couple other things (dialer, sms, google voice, google services) all coming in between 5 and 30 seconds.

Hmm...are you in a bad signal area or leave your radios [3G,wifi, 4G] on all the time?

I suppose I have 3g on. I never leave wifi or 4g on and my signal is between -85 and-96, according to battery info my time without signal is 0%

Well you should turn your 3G off when not using it, that'll definitely save your battery.

I will try that in the future, but it still does not explain why I am getting 1/3 the battery life I used to while doing much more to conserve battery. Could it have to do with my pri and prl and such? Maybe I need to update profile and such, like it's not looking for the right towers? I don't know much of anything about how polling and service works.

What's your wake time vs. your up time?
It sounds like you have something staying awake.
Have you gone to menu>setting>About Phone>software information to see if your PRI version & NV have been downgraded?
What kernel are you using?
Are you using RA or Clockmod for recovery?

countryfried said:
What's your wake time vs. your up time?
It sounds like you have something staying awake.
Have you gone to menu>setting>About Phone>software information to see if your PRI version & NV have been downgraded?
What kernel are you using?
Are you using RA or Clockmod for recovery?
Click to expand...
Click to collapse
I'm not sure how to check wake time vs up time, but it would likely be useless right now, as I nandroid backup, flashed a sense rom, updated my prl and profile, checked to make sure i did downgrade pri/nv and then went back to cm7, so any battery info it is going to give me right now will be inaccurate while I wait for it to charge/discharge again over the course of the night. It does still have my previous information though since it was a nandroid backup and I've had it plugged in entirely since then.
I did succesfully downgrade to 1.77 PRI
kernel is savagedzen 0.2.1 cfs havs wimax GB (2.6.37.4)
RA for recovery.
I also uninstalled a few programs including facebook and twitter in case there was anything like that interfering with my services. I still use Go contacts and Go sms however, but I have unchecked any options with them to have facebook integration. If you could tell me how to check up/wake I can check that tomorrow morning when I wake up to see and go against whatever I had. Currently I'm just trying a few things out before tonight to see if anything had helped. An idle phone sitting on my window sill for 8 hours should not drain the battery THAT much, so something is off.

Go back into men>settings>about phone>battery (you can check it now)
If your up time and awake time are the same, you have a program that's stuck in wake. I also use a program called "system panel" that will show me live time which programs are using the most resources. OR you can use "Battery Monitor".
If you have wifi at home I would suggest you set up your phone to connect to wifi and shut your 3g off. I use a program called "Y5-battery saver". It automatically connects me to wifi at home and disconnects and switches to 3g when I'm away from the house.

attached is a screen grab of the graph from battery info
if needed:
cell standby says time on 15h 44m 47s (same as time listed on battery)
phone idle says 14h 46m 58s
(these 2 items used 47% and 44% respectively
thanks for the wifi tip, i used it on sense a lot but with most aosp roms it causes problems unless you set it to never sleep, and i didnt know what that affect it had on battery so i usually just turned it on when necessary or when in a low-signal area like school.

That doesn't seem that bad for ~14hrs on battery.

my problem is that it's while I'm sleeping. I used to get 36 hours of battery before getting to 15% and being told to plug in, and now I used it a little last night, went to bed and woke up to it being at 28% and was told soon after to plug it in. I just dont remember sleeping destroying battery life like that in the past. granted 15 hours isnt that bad, but when 10 of the 15 hours the phone is just sitting there it worries me because if I were to go through a normal day, where I charge it at night and use it during the day, there is just about 0% chance that I'll be able to make it through the day without plugging it in sometime in the middle.

teh roxxorz said:
That doesn't seem that bad for ~14hrs on battery.
Click to expand...
Click to collapse
yeah, that's not bad. You're still at 87%? LOL. Maybe I need to switch to AOSP ROM!

I'm Back to 87%, I've been on the charger all day, hence the battery graph raise. the dramatic raise was from when I flashed the sense rom to update my profile/prl. (obviously it wasn't monitoring during that time and when i came back and started monitoring again the battery was much higher)
it actually died after ~15 hours, with 10 of those 15 hours having doing nothing. I got systempanel to see if it gives me any more info and the main reason i use aosp is because of the terrific backlight handling. I like it to be super dim while inside and bright outside, and find on sense roms the auto backlight is too bright under normal conditions. I should be getting much better battery life than this. I'll try again tonight with the battery being monitored to see whats up and I'll try going into airplane mode tomorrow to see what that does at night for comparisons sake. hopefully there is just some program using lots of data that I don't know about. i'd love a quick fix lol

It's almost as if there's an Evo "battery curse"!!!!!! It has been HELL finding a ROM that I love that has great battery life. I really liked Myn's but for some reason I could NEVER find a kernel that would give me great battery life. I'm currently using ultrablakk 3 by King's and love the interface, just trying to find the right kernel myself. I think I'll do a nand and try an AOSP for a change. Vaelpak looks stable. Good luck with the battery life issues!

I'm using an unrevoked-rooted evo and at 10% wake time, it lasts for about 15 hours unplugged. That is why I usually keep it plugged in whenever possible. I have task killer and do not synch anything except for weather and news. I do have 3G running all the time as well. I wouldn't do that if it weren't for the email checks (4 accounts checking every 30 min). If the 3G could be automated to turn on during the checks, that would save more battery life, but I don't know of anything to do that yet.

Wifi Battery Drain

Hi guys
I have a LTE Note II and have had this battery drain on standby where wifi will absolutely destroy my battery. This has been going on for months and months and I'm just not sure if Samsung are ever going to resolve this and it is quite the pain in the arse.
I've done many tweaks to my phone, and all location services are off. Also, I've set it as a static IP, but nothing seems to help. I think this is related to the wlan_rx_wake wakelock? I get the impression my phone is responding to the wifi and getting woken up constantly.
Does anyone else experience this and do you have any suggestions?
P.S. please don't mention my apps causing it. It definitely is not. I know my way around Android and also, my Nexus 4 with the same setup (but location + google now turned ON) absolutely annihilates my Note II battery life on standby. This is clearly a Samsung problem that they have ignored for the best part of a whole year, and it seems to be related to wifi.
Any help would be greatly appreciated.
Thanks

Do u have some figures about this battery drain to be able to compare with my phone?
It could be a bad modem/connection. What is your configuration?

Primokorn said:
Do u have some figures about this battery drain to be able to compare with my phone?
It could be a bad modem/connection. What is your configuration?
Click to expand...
Click to collapse
No exact figures but I have been observing it for months now and it hasn't been the case with any other phone I use. With wifi on, it'll drain around 20% overnight. With Wifi off, it'll drain 5 or so %. With Wifi on on every other phone I own/owned, it will barely drain at all overnight.

Type *#0011#
Check wifi setting
Sent from my GT-N7100 using xda app-developers app

This is what I got when I entered that it

After *#0011# go to menu and select wifi in order to see if power safe mode is on.

Yeah it is on
Is that bad?
Sent from my Nexus 4 using Tapatalk 4

That's not bad, it improves battery usage. I don't recognize your problem. Does the phone go into deep sleep with wifi on? Which rom do you use?

Hielko said:
That's not bad, it improves battery usage. I don't recognize your problem. Does the phone go into deep sleep with wifi on? Which rom do you use?
Click to expand...
Click to collapse
Stock ROM. And yeah, but it is constantly being woken up.

Sorry for the bump, but this hasn't changed.
I'm not sure if this is to do with just the N7105, but it is something that just won't go away. I'm now finding I lose between 20 and 30% overnight (around 7 hours) with wifi on, or about 10% with data on. With these both turned off but the phone radio still being on, it only drops about 2% in the same time. This was tested with bluetooth/gps and sync turned off.
I don't really have the time to write up everything that I have tried, but suffice to say I have tweaked the phone a lot over the past few months trying to sort this out, but nothing works.
Here is a quick summary of the stuff I have done.
Firstly, I have to run a stock rom and kernel because there is an app I need that will not work on custom roms/kernels. It also doesn't work on root but I have found a procedure to toggle unroot/root when need be and it works fine. Therefore I'm stuck on 4.1.2 as I want to be rooted but I cannot use any custom rom or kernels.
I have tried factory wiping the phone/installing later versions of 4.1.2, etc etc and the same problems still exists with a freshly wiped phone and no apps installed. This problem also doesn't happen with my Nexus 4 or any other phone I have owned with the same setup, so I am very certain it is not due to a misbehaving app.
I have frozen a lot of bloat with titanium backup, I have hibernated a hell of a lot of stuff with greenify (including system app where there are no perceivable negative consequences)
I have added a few tweaks to the build.prop such as to disable fast dormancy and a few other supposed power saving ones which are meant to help with the msm_hsic wakelock.
There are many other things such as setting a static IP, and also tweaking with my router based on some advise I found on these forums. Nothing much has helped.
Location services and google now are off, and I'm not using the Samsung bloatware apps.
I use betterbatterystats and the partial wakelocks are fine. Very low infact.
However, IMO it is two "kernal wakelocks" which are causing me the problem.
wlan_rx_wake - in regards to the wifi
mdm_hsic_pm0 - in regards to the data
These are by no means outrageously high. My estimation is perhaps 10 mins wake up time and around 2000 "expire time" (whatever that means) every 3 hours or so. However, these two are always the highest kernel wakelock depending on if i'm using wifi (wlan_rx_wake) or data (mdm_hsic_pm0). My phone is also not being kept awake too long too in general.. at a guess around 3 hours awake time for every 2 hours screen on time for every 15-20 hours.
I can't remember if these kernel wakelocks were super duper high in the past, and the fixes I tried actually lowered them, but I still notice this massive Idle drain when on data or wifi (just over 1% per hour - or 2-3% per hour respectively).
In regards to the Wifi.. I suspect that packets are being sent from my router which are constantly waking up my phone. Unfortunately, I haven't been able to solve this problem with any of the router-side fixes I've tried.
This leads me to suspect that the wifi and data radio of the N7105 is power hungry, or I've had a faulty unit since day one. I keep hearing about this stellar battery life for this phone but, for me, the best I've ever got is around 20 hours. This may sound good but the problem is it is 20 hours with 6 hours screen on time, or 20 hours with 2 hours screen on time. This doesn't seem to make a difference where I should be getting two days when I only have 2 hours screen on time.
Any help would be greatly appreciated, and any experiances of others with the N7105 may help find out if it indeed is more power hungry. I'd also like to add that my network does not support 4G yet so this is all on 3G and NOT LTE.
Thank you, and sorry for such a long post.

fade2black101 said:
Hi guys
I have a LTE Note II and have had this battery drain on standby where wifi will absolutely destroy my battery. This has been going on for months and months and I'm just not sure if Samsung are ever going to resolve this and it is quite the pain in the arse.
I've done many tweaks to my phone, and all location services are off. Also, I've set it as a static IP, but nothing seems to help. I think this is related to the wlan_rx_wake wakelock? I get the impression my phone is responding to the wifi and getting woken up constantly.
Does anyone else experience this and do you have any suggestions?
P.S. please don't mention my apps causing it. It definitely is not. I know my way around Android and also, my Nexus 4 with the same setup (but location + google now turned ON) absolutely annihilates my Note II battery life on standby. This is clearly a Samsung problem that they have ignored for the best part of a whole year, and it seems to be related to wifi.
Any help would be greatly appreciated.
Thanks
Click to expand...
Click to collapse
I ain't expert...
but, I would suggest like this :
Go to wifi, press menu and then Advanced (advanced setting of the wifi).
uncheck/untick "Scanning always available"
"Keep wifi on during sleep" = set to Never.
uncheck / untick "auto network switch btwen wifi network and mobile networks"
all these helps me to minimize the usage of wifi during night times (when I sleep). Anyway, device also need to have a deepsleep
Hope can help you as well.
Sent from the corner of this rounded earth.