Samsung Captivate :: WiFi - Sleep Policy Causing Wake Lock For Android System Process And Draining Battery
Dec 1, 2010
After noticing my battery was draining quickly, and then after reading this thread, I installed Android System Info to see what was draining my battery so fast. I notice that whenever I would turn on WiFi, the phone will never go to sleep , regardless of what I set the WiFi sleep policy to. After turning off WiFi, the battery still drains heavily.
The WiFi will shut off after 15mins (if you set it to "When screen turns off" or "never when plugged in"). However it seems to keep the CPU on causing it to drain down the battery.
It would seem that whenever WiFi is enabled, the Android system process creates a partial wakelock that does not go away even if you turn off WiFi. The only way to resolve this is by powering off or rebooting the phone.
You can verify this in Android System Info by going into Battery-History-Other Usage-Partial Wake usage to see how much time the "Android System" process holding a partial wake.
I even did a factory reset on the device; and it is still happening so it doesn't appear to be any app that caused the issue. As I said, it works fine as long as I don't enable WiFi.
I already know of two users having this issue, but I'm wondering if folks having battery problems are going through this as well. Is anyone else having similar issues after using WiFi? I'm hoping someone will be able to identify what exactly is putting the wakelock on and we'll be able to find a fix for it. Other than not using WiFi at all or rebooting the phone after using Wifi.
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Aug 2, 2010
What is your take on the WiFi sleep policy. I do like the fact that Wi-Fi can remain on all the time, but will it be a drain on my battery? Is it better to keep the Wi-Fi to sleep on screen shut off? I am near a Wi-Fi connection for most of the day and always at home.
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Aug 9, 2010
I went to bed at 1am and woke up at 10:20am. My battery was at 65% before bed and 44% when I woke up.
I killed all tasks with advanced task killer as I do throughout the day as well. I don't use the email program on my phone nor do I get any notifications for any other programs. My Wi-Fi sleep policy is set to never because I have Wi-Fi at home. Brightness is at a low setting too. So, any ideas what would be draining my battery during the overnight when I'm not using my phone? I don't have problems during the day when I use it.
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Jul 26, 2010
I am trying to write the system setting using:
Settings.System.putInt(getApplicationContext().getContentResolver(), Settings.System.WIFI_SLEEP_POLICY, Settings.System.WIFI_SLEEP_POLICY_NEVER_WHILE_PLUGGED);
But it force closes my application. Any Idea? My has user following permissions:
<uses-permission android:name="android.permission.WRITE_SETTING"/>
<uses-permission android:name="android.permission.RECEIVE_BOOT_COMPLETED"/>
<uses-permission android:name="android.permission.ACCESS_WIFI_STATE"/
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Nov 12, 2010
I've been getting pretty good battery life (about 14-16 hours on average) when I use the airplane mode trick and kill the Media Hub service. However, my phone has not been able to sleep since the past 2 days and the battery is draining quickly.
The up time indicates that the phone cannot go to sleep. I'm just surprised because I haven't changed any of my phone settings so I don't know why this is happening. I uninstalled the last app that I downloaded and that didn't help.
Should I try doing a hard reset? Are there any apps that will specifically tell me what is keeping the phone awake?
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Dec 12, 2009
I'm confused about the WifI Sleep Policy. What does it mean for wifi to sleep, does it mean to stop searching? Mine is currently set to "when screen turns off", but I've seen others suggest that it be set to "never".
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Jul 22, 2010
If you go to Settings->Wireless and Networks -> Wifi Settings and then hit the Menu button (the one with for squares on the bottom left) and go to advanced there is an option for Wi-fi Sleep Policy. It looks like the default is to turn off wi-fi and switch to mobile data when the screen turns off? Is this the optimal setting? Wouldn't you want it to never turn off (assuming you are in range of wifi)? That way any alerts etc. are all handled over wifi instead of data?
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Nov 18, 2010
Since I got my Captivate just a couple of weeks after it hit the market, I experienced really good battery life. I could plug the charger in at 6:00 when I get up, take it off the charger at 7:30 when I leave for work, and make it til the next morning most days.A couple of weeks ago, I left for work with a full charge, and around 11:00 I took out my phone to test WiFi coverage for some new access points we had installed in the office. The phone felt very warm, and the battery indicator was yellow. For the next couple of days it went like this. I had a spare Samsung battery from when AT&T sent us a new one for my wife's Captivate when she was having random shutdown issues, so I swapped batteries. Things were fine for 10-11 days. Then suddenly last evening about 7:30, when I went to look something up online with my phone, it was very warm again, and the battery indicator was red. Had to put it on the car charger when I left church.When I got home, I put it on the charger all night. By midday today, it was in the yellow, and it finally died about an hour ago. again the handset felt very warm. I don't have a spare USB cable here at work, so will have to wait to get home to charge it. Anything particular I should look for on the phone (running apps, etc.)? Or do I just need to go ahead and place a call to AT&T support?
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Aug 7, 2010
I got my Captivate about a week ago and some far I am liking it a lot. However, I thought I was having some battery issues, as my phone is draining faster than my brother's iPhone.
Using one of the battery status widgets, I've noticed that my batter drops about 1 percent for every text that send and receive (send one text+receive one text = 1% drain) meaning that I'd only be able to send about 100 texts in a day on a full charge. Most days I don't reach that but there are some days which are pretty text heavy. Is this a normal rate at which the battery should be draining for doing something like that? I am using Juicedefender and Advanced Task Killer to monitor what is going on, and the only widget I have running is Fancy Widget.
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Sep 28, 2010
According to a forum post on Android Central, the Sprint Epic 4G has been experiencing battery drain due to a DRM service running in the background that the Captivate also has. They say, kill the service, save your battery:
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Aug 1, 2010
So I have had my phone since before launch and I have noticed the battery drain as others have but here is my question. Do you think it is the battery or the phone?
If I can go to the store and just get a new battery that would be nice because I have rooted and customized and downloaded apps and if it is the battery that is causing the problem it would be so much more convenient to get a new battery.
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Sep 14, 2010
I've heard everyone mention that setting wifi to never sleep has helped battery life but I can't figure out where to find the controls for that policy.
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Apr 5, 2010
Since 1.5 I've been having partial wake problems. My eris normally will last a few hours in airplane mode or with just wifi on before the battery drops one or two percent. Sometimes, it will drop like 5 percent in an hour with low battery usage occuring, for example, when airplane mode is on. I check spare parts under partial wake usage, and it is usually very high, sometimes 100% after hours. I have to reboot my phone to fix these problems.
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Aug 1, 2010
Been having problems lately with my battery performance. im finding that the battery is being used by the android system (96%) even when the phone is on standby through the night. before it used to change to phone idle and cell standby having a high percentage with the android system staying very low, but now the battery is being eaten alive by the android system and the battery is draining rapidly.. i used to get 2 days out of my battery before it needed charging but now im lucky to get just over a day..
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Jul 22, 2010
I am new to smartphones and thought that this might be good for others who are new and don't have the unlimited data plan grandfathered in to know.
This was posted in reply to another question I had had about Pandora so the credit goes to poster MeVirtually.
By default the wi-fi setting is set to go to sleep (and use cellular data instead) when the screen is off, which will most likely happen while you are streaming music as well as other things. To change it so the wi-fi never turns off, to into the phone's menu -> wireless and network -> wi-fi settings -> tap the menu button and select advanced which has an option for wi-fi sleep policy that had been defaulted to sleep "when screen turns off". There you have the option to change it to "never" or "never when plugged in".
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Nov 29, 2009
There are a bunch of threads out there talking about battery usage and how to figure out what's draining your battery.
Almost all of them say to go get Spare Parts app from the market and check you "partial wake usage".
I did that and 95% of my partial wake usage is from "Android System".
Is that normal? Anyone who is getting good battery life (20+ hours) - what do you see in the partial wake usage?
I just checked my phone:
13h 10m 23s since unplugged
Partial Wakelock:Android System Total time: 13h 1m 44s
Is this normal?
The only widgets I have are:
Stock power control widget
Ringer Toggle Widget
I am running GDE in the background (not my default home screen).
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Jul 27, 2010
So before I start, let me say that I have tried this on my wife's Vibrant and my own captivate I get a lock immediately in google maps.
After seeing skyhook in the LbsTest settings I decided to look further into what skyhook is. I read the article below: Samsung to Put Skyhook on Mobile Devices - Midmarket from eWeek
So I thought hey... there are lots of wifi networks around where I live I wonder if it would help if I turn my wifi on.
I get an almost instant lock accurate to 50 meters (good enough for navigation). I have tried it over and over and when I turn off wifi, I get an accuracy of 1700 meters. Turn it back on and get accuracy to 50 meters.
It works indoors and out.
I just noticed that for this to work YOU MUST HAVE "USE WIRELESS NETWORKS" CHECKED under location and security then turn on Wifi (you don't have to connect to any networks). My guess is it narrows down your location based on Cell tower triangulation, then uses wifi to narrow it down.
Here is a blury, crapy, video I made of it:
YouTube - Fix for Captivate/Vibrant GPS issues using Wifi
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Sep 18, 2013
I have samsung galaxy S2 with 4.1.2; when my phone goes in sleep/lock mode the wifi disconnects. when i unlock my phone then wifi connects again. I installed many wifi keep alive applications but none of them work wifi keep alive application which keeps my wifi session on -- even if my phone is in sleep mode
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Aug 11, 2010
I know a lot of us are considering returning our Captivates before the 30 day window is up if there isn't a fix released from Samsung for the GPS problems. I wanted to share what happened tonight. Went into a corporate store and explained to the manager that I wanted to simply exchange my phone for another one, being that my GPS wasn't obtaining a lock. A rep overheard our conversation and blurted out that the "Samsung rep that was in yesterday stated that they are working on a fix that will be out in the next 2 weeks". I explained to the sales manager that the "2 weeks" was beyond the exchange period for me, and I wasn't very comfortable about waiting it out. He kindly offered to extend my 30 day exchange period, for another month. He took out his card, and wrote on the back, Captivate exchange, extended and good until 9/15/2010. I would recommend getting into the stores and getting your 30's extended as well! It cant hurt to give Samsung a few more weeks to try and get this fix out before we start returning these phones in mass quantities.
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Sep 20, 2010
Is it possible to get a refund on the phone passed the 30 days because of the GPS not functioning? I loved the phone till it really sunk in how I paid for a product that missing a key feature. I also ignored the warnings that samsung sucks with updates. Has anyone had any luck returning the phone after 30 days?
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Jul 21, 2010
Every other day I find a point where my phone went to the lock screen but didn't sleep. My battery gets low, less than 15%. Anyone else been seeing this lately?
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Jul 29, 2010
Does Wifi or any preinstalled AT&T apps eat up battery life?
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Nov 24, 2009
Battery life issues for me are over. In the beggining I would be happy if the battery lasted for 2 days. Now I can have my phone always on for 7 days straight, that is 168 hrs (when using very limited wireless data connectivity of course), thanks to Galaxhero and some other tweaks.But anyway, lately I've been doing some tests regarding Google Latitude. I suspected that Latitude was messing (not just) a little bit with the battery life.So, yesterday at 9AM I unplugged the fully charged phone that had the Latitude feature on. Result: at 5PM the battery was at 90%.Today, I decided to turn off Latitude (leaving the rest of the configurations intact) and unplugged the fully charged phone again at 9AM. Result: it's 5PM and the battery status is at 100%.
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Aug 3, 2010
The last day or so after charging my phone to 100% overnight (phone is on when charging) and then putting in standby mode I'm losing like 5-7% of battery every hour.Over the weekend I was losing just 6% every 9 hours in standby mode. Today in 4 hours time I'm down to 65% already with mostly standby mode and a few minutes of browsing. I even had JuiceDefender installed since last night and it's not helping at all.To me it seems that something is in the background that is draining the battery though I when I check running services I don't see anything that shouldn't be there. When I was losing only 6% every 10 hours I did have a live wallpaper, weather/clock widget, and task killer. I didn't change anything on the next charge and now I'm constantly losing battery even in standby mode.
I have Wifi/GPS/background data off, brightness at minimum, no animations, etc. So pretty much followed all the battery saving pointers. I thought it was working good when I got just about 36 hours over the weekend with standby and moderate usage. So I don't know what has happened to my battery all of a sudden.The two times that I have managed to do 30+ hours on a single charge I had Advanced Task Killer running.However, even after doing 36 hours on one charge the next day even with ATK the battery started to drain a lot every hour in just standby. Anyone else having similar issues? I don't know what else to do at this time. I've uninstalled many of the apps thinking it might one of them causing the issue, but still having issues.
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Jul 16, 2010
Battery is draining fast on SGS. comes down from full charge at 4 am to 70% by 8 am without any usage. During the day will have to charge it twice. Any possible causes or tips to manage it? am on EDGE with air-tel but use wi-fi mostly.
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Sep 24, 2010
Many of us have experienced some battery life fall out since the last update. I mentioned this in the battery life thread but I thought it deserved it own topic. I have an app that I downloaded called battery status. it has a battery history. and it says time without sleeping 7h 10m 25s ago. Thats exactally when I unplugged my phone. This explains why I am seeing 2-3% per hour loss while not using the phone and while in airplane mode. Before the update I could keep the phone in airplane mode, not usre it, and leave work with over 94% battery life. So this proves that somehow the phone is not going into sleep mode... I can guarantee that everyone else in that is experiencing battery drain since the sept 16th update is due to this reason. The question is... why the hell is this happening and why won't the phone go into sleep mode?
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Sep 5, 2010
I'd like to thank the people over at XDA.I think they may have found the culprit for the horrible battery performance some of us are seeing. There are two threads of interest over there:Time without signal > 50% - xda-developers Wow battery from 100 to 10 in 3 hours xda-developers.The short of it is that the 3G signals don't stay locked and the phone keeps hunting.If you go under the battery life settings and click on "Cell Standby" there's a field for "Time Without Service".Mine and many others were hover around 50%.This is constantly draining battery even while you do nothing.So the temporary quick fix is to turn on Airplane mode, then turn it right back off.This fixes some incorrect setting.On my phone, Time Without Service dropped from 52% last night to 0% today.And my battery only dropped about 9-10% idling over night.This is MUCH better than the 30% draining overnight I was seeing over the past few days.
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Dec 2, 2010
I noticed this today, I use my phone to USB tether, and after coming home from running errands today my phone was at about 80% battery life, so I put it on the USB cord that it came with and connected it to my computer so I could check email and facebook, etc. Well after a few hours I took my phone off the charger and the battery had dropped to 40%. How is this possible, I know tethering uses power from the phone, but if its connected to the computer and charging as well, why is it still draining my battery? my droid never had this problem and i tethered all the time, is it possible that I have a bad battery?
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Nov 17, 2010
I just rooted a few days ago. Put a custom ROM on it (KaosFroyo v38). Ever since I rooted my battery dyes in about 3 to 4 hours. My phone says its awake 99.9% and the android OS is using 40-50% battery. Is it possibly the ROM? If so how can I change to a new one? I have a Droid Eris.
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May 23, 2009
My app seldom needs to put the device (or screen) to sleep. That is - programmatically imitate user pressing on red stop-call button. According to docs PowerManager.goToSleep() does just that, but requires android.permission.DEVICE_POWER, which is never granted to apps!
(A) What on earth should I do to get this working?
(B) How can I programmatically wake up the device.
just to clarify - I'm not interested in a wake lock solution.
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