yashsingh1/xdaforums huggingface dataset:
[Galaxy Note 4 General] Infinitesimus:
Changing the router might not always solve it if the problem is some device on the network broadcasting through the router. In that case, you're giving the device a different avenue but the result is the same.

By different router, I meant have one network dedicated to the phone and the other for all other devices (Sorry if it wasn't clear) and then monitor the behavior. So phone connects to Shin's Network 1 and everything else is on Shin's Network 2.

Alternatively:

Is your device rooted? If it is, you might be able to install Shark or Network Log to try to identify what devices are sending you constant messages (You should be able to see the IP address). With the IP address, you can check the router's DHCP table and use that to figure out which device is responsible. Or if you can live without it, turn your devices off (mainly windows machines, printers, etc.) and see if you still have the drain when they're off. Hopefully we can get to the root cause for everyone here
[Galaxy Note 4 General] shinasurada:
The device isn't rooted and this is the only device connected to the WiFi network. I turned off the rest to test.
[Galaxy Note 4 General] MyPeople:
Since I have my note 4 n910c I wasn't very happy with the battery. It has same battery than my note 2 and I ne er changed the battery to my note 2...

I installed the app that the OP says and I have been using the phone 1 hour non stop and look my stats. Horrible results, wifi spend the same battery than the screen!!!!

Is it a HUGE bug or maybe it's a problem of the app? only n910c is showing so horrible results?

I thought n910c would have same or a bit better battery than snapdragon note 4!!!

If that's really a bug we need to talk about it everywhere so samsung can fix it. I hope it's not a hardware problem (wifigate)
[Galaxy Note 4 General] drmodify:
Its the exynos chip that has a problem IMO. Even my exynos based sammy tablets have this wifi drain. The things you could do best are:

1) calibrate the battery. Sometimes when we run out of juice and we turn on the phone voila there still is some 5-15% power. So try to totally drain the juice of the phone to the point that even if you turn it on, it wouldn't. Then charge to 100% screen off

2) if you are rooted install a custom kernel

3) wait for Lollipop
[Galaxy Note 4 General] MyPeople:
My battery has been discharged completely pupae of times and I still had the feeling of the battery being not so good. But it was only now that I installed the app that I could see why..So the calibration theory is not good enough.

I prefer stock kernels so flashing a custom kernel is not a good solution for me.... but if it's the only way to fix it then maybe I have to do it

Was the issue fixed with new official roms on your exynos tabs? If not then maybe we should not expect this to get fixed with lollipop.

If things are like the screenshot of several users show (including me) then I think we have to make some noise so samsung address the problem.

Maybe the OP should be edited to "wifi bug on n910c" or similar so more n910c users can test which results they have
[Galaxy Note 4 General] neograniceni:
I have Galaxy Tab S 8.4 (WiFi only) with Exynos SoC and seems it doesn't have such problem. According to gsam battery monitor WiFi uses ~3-4% between charges. But my Note 4 N910C in two days light use uses ~30%.
[Galaxy Note 4 General] djkidy123:
Same problem here they give me a new one, hardware problem!
[Galaxy Note 4 General] shinasurada:
did the new phone have the same problems? Can you test it?
[Galaxy Note 4 General] exclass:
Maybe this does not have anything to do with WiFi but I found out that when hovering the s pen on the screen, processor cores work faster consuming more battery. I myself use the pen all the time, even for normal browsing. Monitoring the cpu when hovering the s pen on the screen I noticed that the A53 cores never go below 1300 MHz, which is their maximum frequency. I can approximately say that using fingers and not s pen gives about 1 hour of screen on time more.

Also for those who find themselves in a bad situation on low battery and want to get the most of it, I suggest reducing the screen size to minimum using one handed input in settings. It can save a lot of battery because about half of the screen's pixels won't be lit.

Hope it helps.
[Galaxy Note 4 General] azuldio:
I agree with MyPeople. Is there any way to notify samsung about this? I tried contacting their Customer Care, but they said to give the phone for servicing or it must be a battery problem. Unfortunately I cant do that as I bought my Note 4 from one country and using it in another.

Well, even the guys using a SD805 version of the note 4 are using their SPens and all features without having to change settings or anything else. At the end of the day its all Note 4, but as their internals are different, you can see drastic differences. I follow all MKBHD videos and reviews. Take a look at this. While mentioning about battery life, he mentions that the Snapdragon version that he has outperforms the Exynos one by a large margin. Why dont you guys check that video out? Samsung note 4 review by MKBHD. (Cant post url here as I am new and need to have at least 10 posts before I can put URLs )
[Galaxy Note 4 General] sams_only:
Non root N910C (Thai).

For the first 50 minutes after full charge I only use tapatalk with wifi. Wifi usage is 5%.

Then I use flipboard (built in app) for 15 minutes. And wifi usage jumps to 28%.

Both screenshot attached. I don't know what this means but it's not normal. May be some system apps misbehave.
[Galaxy Note 4 General] tmac31:
He also said its about exynos 910u version which he had doesnt support us 4g frequincies so it was constantly searching for signal and wasting battery.

Im using 910c and my my friend has 910f we are getting same screen on time like 6-7 hours everyday. I didnt tried what wifi draining but i didnt notice any problem about battery too i ve been using note 4 for 4 months now.

And note 4 exynos has definetly more agressive cpu governer. Little a53 cores pretty much at full freq if you are scrolling etc thats why exynos is more smoother in general performance especialy very noticable scrolling smoothness difference in apps like twitter.
[Galaxy Note 4 General] ljubimci:
Nothing like that in my case.

Proud owner of N910C, WiFi always on, even during the night, it takes nothing significant out of battery juice. Can't say at all that this is universal C problem.

Sent from my GALAXY Note 4
[Galaxy Note 4 General] shinasurada:
I have three OEM batteries. same issue regardless of which battery I use.
[Galaxy Note 4 General] milton72:
Okay if you are having WiFi issues and it disconnect every 3-4 min here is the fix

Go to phone

On the keypad dial *#0011#

Automatically should go onto a screen

Press menu

Go WiFi

There should be a button there saying WiFi saving and it should be ON turn it OFF

And then reboot

Done

Maybe this is helpful
[Galaxy Note 4 General] shinasurada:
Tried that previously didn't work.

My WiFi is not disconnecting either. At least it doesn't say so on my device.
[Galaxy Note 4 General] sPEADy:
There is an App called Easy Battery Saver Here you can make your advanced configurations and check if it helps. It disconnects wifi and data connection automatically when screen is off and much other stuff. I am using it since 2 years very nice app, give it a try.

Good luck.
[Galaxy Note 4 General] shinasurada:
May I ask if the WiFi is connected ? Also, which firmware do you have and what country is the phone from?

Thanks
[Galaxy Note 4 General] undead_assault:
I am using N910H Exynos, it looks like my Wifi usage doesnt use as much as yours. Will try again tomorrow.
[Galaxy Note 4 General] ljubimci:
Of course it's connected, to my home Asus wireless router. I use data plan only when outside, otherwise wifi stays on all the time.

Here are the screenshots with sw/kernel versions, my phone is bought on contract from Serbian operator.

PS: I still have 42% battery from yesterday.

Sent from my GALAXY Note 4
[Galaxy Note 4 General] shinasurada:
Damn, my phone is completely identical To yours other than the WiFi drain
[Galaxy Note 4 General] fusionXERO:
Thought I'd contribute, I was looking to buy an N910C model before this thread, and I can say I finally own one, and I am NOT experiencing any WiFi drain issues.

I was hesitant about this issue being real in my phone during the shipment, but I'd like to report back here after 4 days of use and connected to my WiFi (5GHz band) since day one.

Config:

SM-N910C

Stock ROM

Stock Kernel

Rooted

Xposed installed (other modules enabled)

Lots of forced uninstalled apps via Titanium.

Hope this gets resolved.
[Galaxy Note 4 General] ljubimci:
^

You've been using your phone 1minute and 38 seconds after plugged out of charger (or after installing GSam app), this screenshot is not much helpful.

Anyway, to the author of this topic, sorry to hear we have the same device an you have issues. Here, I left my wifi on all night to check the drain with this GSam, here's my result after 12 hours being connected to wireless. Really really minor drain caused by wifi.

Wait for lollipop update and hard reset the phone it before applying the new software, it might be fixed amongst other bugs they plan to fix.

Best.

Sent from my GALAXY Note 4
[Galaxy Note 4 General] shinasurada:
Is your wireless on 5GHz? Are you on 802.11 a b g n or ac?

Thanks in advance...
[Galaxy Note 4 General] MyPeople:
I installed AOA2 odin rom from note4roms.com and I tested wifi for 2 hours.

The results were very good. Wifi used 3% of battery only. So I thought maybe the new Odin rom or bootloader solved the problem.

But then I flashed root and recovery and the results of the battery usage by wifi are very very bad again. More than 20%...

I don't know if the problem is caused by root or customer recovery but I don't think so.

I think it was just casuality that the problem didn't happen after flashing the AOA2.

N910C users without the problem can please tell which rom they have and if they have root or custom recoveries ?
[Galaxy Note 4 General] ljubimci:
2.4GHz (B + G + N) is what my router system info says.

Stock rom no root.

I don't see the point of rooting/customising in any way a premium device like this.

Sent from my GALAXY Note 4
[Galaxy Note 4 General] fusionXERO:
This was right after I installed gsam late at night with connection to WiFi the entire day, I will try to post another screenshot with an elongated duration when I can get the chance.
[Galaxy Note 4 General] shinasurada:
I'm completely stock and no root too. 2.4 ghz b g n WiFi as well.

I'm hoping its the firmware but from the screenshots ljubimci posted, I'm running the same ROM. Malaysian ROM and phone.
[Galaxy Note 4 General] fusionXERO:
Per my last post, here is the WiFi stats on my N910C after 1 hour of monitoring

(keep inind I have been connected to WiFi a lot longer than that).

I can have gsam monitor my phone as I sleep throughout the night for a better stat.

But what I would really encourage, is that the OP (since you're not rooted) to turn off/uninstall all Google/Samsung apps and other bloat.

Config:

N910C

Stock ROM

Stock Kernel

Rooted

Exposed installed (gravity box user)

Uninstalled all google/Samsung apps.
[Galaxy Note 4 General] shinasurada:
I think I got it figured out.

those of you who experience the horrible WiFi drain must be using the Google now launcher.

This seems to be the cause, I need to observe the phone for a longer period of time.

Anyone have any theories as to why Google now launcher causes this on the n910c note 4?

I run the Google now launcher on an SD805 phone (galaxy s5 prime) yet it doesn't set to have this issue...
[Galaxy Note 4 General] azuldio:
I suppose not. I am using TouchWiz only. Even Google Now is Turned off on mine.
[Galaxy Note 4 General] sams_only:
For me, as long as I don't use any preinstalled apps, wifi drain is small.
[Galaxy Note 4 General] shinasurada:
Update:

its better with touchwiz compared to the Google launcher but still significant.

Edit: scratch that. Its as bad.

Update 2: Completely reset the phone and installed nothing but gsam app, no improvement. It seems like the battery drains if there is wifi data being transmitted, such as when downloading or actively using wifi data.
[Galaxy Note 4 General] shinasurada:
anyone tried the lollipop update?
[Galaxy Note 4 General] djdurance:
I too have this issues on my 910.

However I turned location from high accuracy to 'GPS only'. This massively reduced my WiFi penalty. Probably not where it should be but really close. On the app front this shows up as a big reduction in Google Play Services.

The way I figured this out was realizing that changing the location mode to "low power" actually increased the drain significantly.

Hope that help. Hopefully someone can test lollipop out and see if this is fixed.
[Galaxy Note 4 General] shinasurada:
That's not a real fix as you said.

I realized amount of data used is proportional to the WiFi drain, so if you download something, the WiFi drain is really high. And if you let it idle, its not as bad.

sounds stupid but what I'm trying to say is we are using more energy per MB of data. The drain isn't really there when the WiFi is connected but not transmitting anything.
[Galaxy Note 4 General] slink_59:
With Lollipop

Sent from my SM-N910C
[Galaxy Note 4 General] shinasurada:
Damn it. Hope just went up in smokes.
[Galaxy Note 4 General] djdurance:
I'm going to be working on this today and will post some results with results.
[Galaxy Note 4 General] xishp117x:
On lollipop and I'm getting 6 hours of screen on time with heavy usage!
[Galaxy Note 4 General] djdurance:
Was this with the n910c? And can you screenshot your wifi % usage? Was this using the internet or video/gaming?

---------- Post added at 02:49 AM ---------- Previous post was at 02:37 AM ----------

I think this sums it up well - on idle the drain is manageable.... Might go through a full day with 2-5% battery drain with wifi if I'm not streaming anything.

However, as soon as i start streaming something... Bam, wifi jumps through the roof. Downloaded 200 mb watching youtube over wifi and went from 5% to 33% of usage. Higher than the screen!!

Are we sure this isn't a problem with the GSam Battery App? I seem to be getting 4-5 hours of SOT of mixed usage and can go a full 20 hours with that with everything turn on except high accuracy location services.
[Galaxy Note 4 General] shinasurada:
Is that with WiFi?
[Galaxy Note 4 General] djdurance:
This is a snapdragon note 4 screenshot - are we sure this isn't just the app we are using? I checked and he played a bunch of youtube via streaming and saw his wifi % jump like crazy.
[Galaxy Note 4 General] xishp117x:
Yes, with the 910-C on AT&T service and on WiFi. This is today's use. The 6 hours was yesterday and I would say it's close to attaining the same twice in a row!
[Galaxy Note 4 General] shinasurada:
The App seems to work fine(show minimum wifi usage) on all other devices I have installed them on. Galaxy Tab S 8.4, S5 LTE-A, Nexus 6, Note 4 Snapdragon.
[Galaxy Note 4 General] milton72:
I have the same problem. But I tried a app called root booster you can find in the games and app section en the wifi is down to 3%
[Galaxy Note 4 General] MyPeople:
[MENTION=3296134]gekkehenkie11[/MENTION] that was a master explanation thank you.

We need more people with your knowledge :)
[Galaxy Note 4 General] jdomadia:
90% people's either don't know xda or if they know they don't visit regularly & they don't know about advance levels of settings , so if they are facing bug & huge battery drain service centres get flooded with mobile. Below is my screen shot from n910c without root, without disabled any blotwears.
[Galaxy Note 4 General] Fahad M.:
my 910c is brand new, bought 2 days back and it is pissing me off really badly. thinking to throw it against the wall. the battery hardly lasts 16-17 hours with moderate use with SOT around 3-4 hours with lowest brightness. my one m8 was way better than that. any help would be highly appreciated. im stock 4.4.4.

---------- Post added at 09:08 AM ---------- Previous post was at 08:54 AM ----------

i have the malaysian one and it drains it too fast. what the hell :(
[Galaxy Note 4 General] kapybarus:
Is big drainy facebook and chrome app usage something new on lolipop or on lolipo we can just see it clearly?
[Galaxy Note 4 General] bomczz:
Weird.. i got lollipop
[Galaxy Note 4 General] Infinitesimus:
Mind showing a screenshot of the wifi details from GSAM? I just realized that according to gsam, System has an incredibly high use of wifi.... time to sniff and see what the trigger might be (if this kind of use isn't normal for a day's use). Silly work wifi.
[Galaxy Note 4 General] bajica:
For me in settings it show wi-fi is used all the time but in gsam it shows correct usage
[Galaxy Note 4 General] shinasurada:
Any updates?
[Galaxy Note 4 General] Fahad M.:
after updating to kitkat, after 3-4 routine restarts and after 2-3 days use, i can get 6 hours SOT with automatic brightness turned on, location on to power save and every other feature running. total usage with 6 hours SOT is around 25-30 hours with WIFI ON. i have found one more thing, when my network signals are weak, battery drains too fast but when signals are strong, it doesnt drain at all.
[Galaxy Note 4 General] Tricks25:
Hey guys..

Just want to ask.. You see i have wifi always on at the graph but technically my wifi is off.. I also did untick google wifi scan but the "wifi on" still persists.. Tried and search for probable solutions but i think i hit a dead end. I think this is my culprit for heavy draining on my phone..

Im unrooted btw, but if theres a way to fix this with root then ill consider rooting..
[Galaxy Note 4 General] Asad Khan 2085:
Hey guys just wanted to share my battery stats.

Last week i updated to 5.0.1 lollipop on my SM-N910C and i was getting battery drains and i was getting 7 to 8 hours max. That was wierd and got me worried so i cheked my wifi settings and in advanced settings "Always allow scanning" was ticked and that was the real battery drainer.

After unchecking that i am getting pretty decent battery and SOT ?
[Galaxy Note 4 General] joker1973:
Thank you for sharing. I shall test if it works
[Galaxy Note 4 General] Gecy87:
I had the same battery problems with my n910c on KK an later on Lolipop. But now i switched on slovenian version of android 5.0.1 and my SOT inproved significantly. Before i couldn't get more than 3 hours SOT. Yesterday i got 5,5 hours. But yes, wifi still consumes over 40% and screen somwhere around 30- 35%.
[Galaxy Note 4 General] justvalencia:
I've got the n910c here. No problems with my battery usage and wifi. I am also unrooted. I am also unrooted and i can actually reach 8hours SOT. maybe there's something wrong with the settings?
[Galaxy Note 4 General] Gecy87:
Would you mind telling us which country are you from? And what firmware you are using?
[Galaxy Note 4 General] justvalencia:
What firmware are you talking about? sorry i'm new to android. I am from Philippines anyway. If you want i can post my battery stats.

roaring from the beast NOTE 4
[Galaxy Note 4 General] shinasurada:
The OS firmware. download phone info Samsung app and you will be able to see it.
[Galaxy Note 4 General] justvalencia:
Don't know if this is the right one

roaring from the beast NOTE 4(N910C)
[Galaxy Note 4 General] darkbahamut:
From using my own N910C I think there is a bit of a problem, but at the same time apps like GSam are misreporting things a bit.

When GSam shows it's percentage for wifi battery usage, what I believe it's actually showing is wakelocks held by the wifi device. Now for some reason the N910C holds a 'wlan_rx_wakelock' (amongst others) whenever the device is using the wifi, even if the device isn't trying to sleep which isn't normal on most devices. Now it's important to make clear that holding a wakelock when the device is on makes no difference to power usage at all. Whats this means is when people show images of wifi being at >30% (for example) these figures are clearly false. Wifi hasn't used 30% of your battery, it's just held a wakelock for 30% of the time, but this could have been while you were using the device and therefore is totally 'normal'.

This was sort of noted in this post by gekkehenkie11 where it was mentioned that what you're seeing is wifi wakelocks. That's true, but what isn't taken into account is how the N910C is counting a wifi 'wakelock'. A wakelock shouldn't be counted while the device isn't trying to sleep, but for some reason it is counting that as a wakelock on this device. Maybe it has something to do with how the wifi chip connects with the Exynos 5433 SoC, but either way unless the wakelock is being held while the device is trying to sleep then it's not a problem. Unfortunately, using your phone then posting GSam stats doesn't tell us this, so they are basically pointless to post.

The area of interest here is does the N910C hold a (wifi) wakelock while trying to deep sleep more often than it does when you are using a mobile network? The answer is it does slightly, but do N910F devices? People would need to do standby runs of a 910F using mobile then wifi to compare how much the device deep sleeps depending on the network state.

Ultimately the N910C's wifi isn't really using that much power, you are all just being caught out by how it's reporting a 'wakelock', and how GSam is picking that up (badly). I can post high wifi 'wakelocks' like other heres, but then I can also show images after 1 hour web browsing on wifi only using 8% battery in total, so clearly the wifi chip isn't hurting the battery that much.
[Galaxy Note 4 General] shinasurada:
imagine this scenario, two phones one N910c and one N910F both fresh off the charger and being used for.1 hour straight no standby. Both would have the same wakelock I would presume? However the n910c tends to show a higher WiFi %. Can you please point out what I'm not getting here?

Also why do some n910c users have no such issue at all?
[Galaxy Note 4 General] willingtan:
Guys, I'm on Lollipop. N910C. Unrooted. I'm getting bad battery life. And today I was surprised to see KNOW consuming so much data. Funny thing is, i don't remember turning know on!

Any ideas.... A bit worried why Knox is doing this...

Thanks!
[Galaxy Note 4 General] justvalencia:
hhmm would also like to know more about this. Let's wait for others who have an idea

roaring from the beast NOTE 4(N910C)
[Galaxy Note 4 General] jdomadia:
May U enable this?
[Galaxy Note 4 General] willingtan:
Yeah, i checked. It was disabled.

I did a hard reset last night. I don't see Knox anymore.

Thanks!
[Galaxy Note 4 General] willingtan:
Do you guys know why these apps are using so much battery?
[Galaxy Note 4 General] Toss3:
Depends on which apps you have running the background. Turn off everything but the essential apps, and then start to enable them one by one to get an idea of what is messing up your battery life (are you using torrents? If so that could very well explain the high usage).
[Galaxy Note 4 General] willingtan:
Unfortunately, I don't use any torrents. Strange is it?
[Galaxy Note 4 General] robertbr108:
I have the same battery drain problem, I opened a service request on the Samsung site, let's see what they will say. I have tried everything but except turning wireless and location off nothing helps. I hope they will have the decency to at least accept the problem.
[Galaxy Note 4 General] robertbr108:
After three days no answer from Samsung, very good service... Very disappointing
[Galaxy Note 4 General] Kanon25:
This is exactly why Samsung will never be a premium player - they have no clue about the value of service embedded in the product. They just shove out hardware. But this is not 1995.
[Galaxy Note 4 General] xdm9mm:
I thought I'll just chime in. I have observed KNOX draining my battery but then I use Knox on my phone. I went to recovery and cleared DATA cache... after that Knox is now behaving... you might want to try resetting your data cache and see what happens to your wifi drain.. I have not o served any wifi drain on my N910C.