[Q] SGS2 wifi constantly scanning - AT&T Samsung Galaxy S II SGH-I777

Hi all,
The Wifi on my SGSII is constantly scanning even though it is connected to my home wifi network (a WPA/WPA2 PSK secured connection on a G band router). The signal strength is "excellent" and I have the phone sitting right next to the router. Further, I have network notification turned off ( unchecked) and under advanced settings, my Wifi sleep Policy is set to "never".
Sprint users have reported exactly the same problem on the Epic Touch 4G" (http://forum.xda-developers.com/showthread.php?t=1272226 ). Has anyone else been experiencing the same issue on their ATT SGS2 ? I would be very grateful if someone could post a solution for this issue.
Thanks in advance
J
PS: My wifi setting screen looks like this genteman's ( except i have network notification turned off)
(http://keithandlaura.smugmug.com/Other/test/i-sMwh6bj/0/L/SC20110921-212528-L.png)

jwlkr said:
Hi all,
The Wifi on my SGSII is constantly scanning even though it is connected to my home wifi network (a WPA/WPA2 PSK secured connection on a G band router). The signal strength is "excellent" and I have the phone sitting right next to the router. Further, I have network notification turned off ( unchecked) and under advanced settings, my Wifi sleep Policy is set to "never".
Sprint users have reported exactly the same problem on the Epic Touch 4G" (http://forum.xda-developers.com/showthread.php?t=1272226 ). Has anyone else been experiencing the same issue on their ATT SGS2 ? I would be very grateful if someone could post a solution for this issue.
Thanks in advance
J
PS: My wifi setting screen looks like this genteman's ( except i have network notification turned off)
(http://keithandlaura.smugmug.com/Other/test/i-sMwh6bj/0/L/SC20110921-212528-L.png)
Click to expand...
Click to collapse
Scan rate is bumped up significantly when you're in the settings menu.
Have you confirmed via logcat that it's scanning frequently outside of the settings menu? It shouldn't be in that case - but without logcat it's almost impossible to tell.

Entropy512 said:
Scan rate is bumped up significantly when you're in the settings menu.
Have you confirmed via logcat that it's scanning frequently outside of the settings menu? It shouldn't be in that case - but without logcat it's almost impossible to tell.
Click to expand...
Click to collapse
Entropy,
What should I be looking for in logcat? I have Betterbattery stats installed and according to that, Wifi scan time is 8+ hours even though Wifi on time is only 2+ hours. That doesn't seem to make sense, but what do I know.
I am running UnNamed 1.3.1.

johny_i said:
Entropy,
What should I be looking for in logcat? I have Betterbattery stats installed and according to that, Wifi scan time is 8+ hours even though Wifi on time is only 2+ hours. That doesn't seem to make sense, but what do I know.
I am running UnNamed 1.3.1.
Click to expand...
Click to collapse
I believe BBS is reporting scan time improperly. I've seen that in a few threads.
Sent from my GT-P7510 using Tapatalk

You're probably right, except now scan time doesn't even show.

I have also observed this on my phone.
I have a Samsung Galaxy IIs, using a Sony Ericsson MW600 BT handsfree as well as a Pioneer car Bluetooth handsfree system.
I have not measured anything yet, but I notice that when the Wi-Fi scanning is going on, I get significant disturbances on both of my Bluetooth hands-free sets. Listening to music is without a hitch, but talking on the phone (Norwegian GSM - operator Telenor) is terrible.

i also noted this after installing the OTA update to 2.3.6 today. I just rooted mine yesterday after reading 54+ pages to make sure i understood everything. i had a cappy and loved installing new roms but have not taken the plunge yet on the sgs ii. I haven't noticed a huge difference in battery yet, but it has only been a couple of hours since the update.

What ROM are you running? You can edit the build.prop to change how often it looks for networks. It is the line "wifi.supplicant_scan_interval=xx". I set mine to 180 which is 3 minutes, some ROM's set it really low. Also the scan rate is bumped up significantly when you're in the settings menu like Entrophy said.

Hi,
I had the same problem where my WIFI was fluctuating.... I dont know if this is the problem/ solution but this is what happened...
My SGS 2 is already rooted and unlocked. I had flashed the Entrophy DD 12/23 first then I had flashed Unnamed Custom ROM. After rebooting the phone, I saw the Wifi was not stable. So I again did a "Wipe Factory Data Reset" and "Wipe Cache Partition" and then installed the Unnamed Custom ROM from the SD Card. My Wifi is pretty stable now.
I am not sure if you guys had this issue when flashing a ROM but this seemed to fix it.

Wifi Scan - Milliwatts
ktoonsez said:
What ROM are you running? You can edit the build.prop to change how often it looks for networks. It is the line "wifi.supplicant_scan_interval=xx". I set mine to 180 which is 3 minutes, some ROM's set it really low. Also the scan rate is bumped up significantly when you're in the settings menu like Entrophy said.
Click to expand...
Click to collapse
I have written about this wifi-battery drain a while back here in XDA.
When I used to have my Nokia symbian cell phone I used to flash custom roms
and there were a lot of nice new features after flashing.
A couple of the really nice battery saving mods were:
#1: added option to change the amount of wifi milliwatt output from 18 milliwatts (default) to 3 milliwatts
which is more than enough if the phone is no more than 20-25 feet from the wireless router.
(the mod gave the option of 3mw,6mw,12mw & 18mw)
Saves a lot of battery life.
Don't know why none of the DEVS have addressed this issue yet.
#2: added a mod so once the wifi establishes a connection it no longer scans
at all unless the connection is disconnected or lost.
So in other words, the phone only scans for wifi until it connects.
Right now I am connected to wifi with my phone and yet in settings it displays "scanning"
non-stop-constantly even though in wifi settings it displays "connected".
Why should the phone be scanning for wifi if it's already connected? (I have no idea).
Don't know why none of the DEVS have addressed this issue yet either.
Both of these mods really made a noticable difference in battery life
for for me since I do use the wifi feature in my phone a lot.
Hopefully one of the DEVS can look into these issues soon.

Now someone mentioned wifi constant scan, I noticed mine is doing the same thing. I leave the wifi setting screen on, it re-scans every 3 seconds!

Misterjunky said:
I have written about this wifi-battery drain a while back here in XDA.
When I used to have my Nokia symbian cell phone I used to flash custom roms
and there were a lot of nice new features after flashing.
A couple of the really nice battery saving mods were:
#1: added option to change the amount of wifi milliwatt output from 18 milliwatts (default) to 3 milliwatts
which is more than enough if the phone is no more than 20-25 feet from the wireless router.
(the mod gave the option of 3mw,6mw,12mw & 18mw)
Saves a lot of battery life.
Don't know why none of the DEVS have addressed this issue yet.
#2: added a mod so once the wifi establishes a connection it no longer scans
at all unless the connection is disconnected or lost.
So in other words, the phone only scans for wifi until it connects.
Right now I am connected to wifi with my phone and yet in settings it displays "scanning"
non-stop-constantly even though in wifi settings it displays "connected".
Why should the phone be scanning for wifi if it's already connected? (I have no idea).
Don't know why none of the DEVS have addressed this issue yet either.
Both of these mods really made a noticable difference in battery life
for for me since I do use the wifi feature in my phone a lot.
Hopefully one of the DEVS can look into these issues soon.
Click to expand...
Click to collapse
Power control - Not likely, unless there is some documented power control already in the driver it's not going to happen. We're in a bad enough state as it is trying to make the chip not fire interrupts at 1 Hz on the Infuse.
Broadcom is one of the least open source friendly chipset manufacturers on the planet - their drivers have NO comments or documentation whatsoever, and datasheets are not available.
The rescan stuff is probably only addressable on Cyanogenmod, messing with it would require source code for the userland wifi management stuff.
mickey4mice said:
Now someone mentioned wifi constant scan, I noticed mine is doing the same thing. I leave the wifi setting screen on, it re-scans every 3 seconds!
Click to expand...
Click to collapse
As stated earlier in this thread - this is by design. It is assumed that if you're in the settings screen you want to change networks and have an up-to-date list.

I also am having this problem. I am running the rooted UKK6 from entropy512. After turning on my wifi, my battery drained from 90% to 70% in 5 hours with no use. My android OS is running at 80-90%. I don't have any extra apps except for 3g watchdog and CPUSpy and BBS. I do have Go launcher and GoSMS installed. As soon as I turn wifi off, i can see my battery level off under settings. I have searched for the last 2 days for a "fix". no luck.

Battery Drain
hatgirl223 said:
I also am having this problem. I am running the rooted UKK6 from entropy512. After turning on my wifi, my battery drained from 90% to 70% in 5 hours with no use. My android OS is running at 80-90%. I don't have any extra apps except for 3g watchdog and CPUSpy and BBS. I do have Go launcher and GoSMS installed. As soon as I turn wifi off, i can see my battery level off under settings. I have searched for the last 2 days for a "fix". no luck.
Click to expand...
Click to collapse
Try doing a clean flash using "wipe data/factory reset" in CWM
recovery and then see if the phone has normal battery drainage.
(which it will if you flash the UnNamed v2.2.1 custom rom)
Then install one app at a time so you can find out exactly which
app is the culprit that causes your excessive battery drain.
This is the best way to trouble shoot battery drainage issues.
You will see that your battery drainage issue is not caused by
the custom rom, but it is caused by a few apps which are just
not very battery friendly.
The UnNamed v2.2.1 rom is the best custom rom currently
available for our i777 phones and it has outstanding battery life.
Good Luck!

hatgirl223 said:
I also am having this problem. I am running the rooted UKK6 from entropy512. After turning on my wifi, my battery drained from 90% to 70% in 5 hours with no use. My android OS is running at 80-90%. I don't have any extra apps except for 3g watchdog and CPUSpy and BBS. I do have Go launcher and GoSMS installed. As soon as I turn wifi off, i can see my battery level off under settings. I have searched for the last 2 days for a "fix". no luck.
Click to expand...
Click to collapse
This has nothing to do with this thread - This thread is talking about wifi scanning.
Drain problems - read my known battery drainers thread. A lot of people are having problems, there is no fix, and there won't be until all the people complaining start actually collecting some data.

Related

[Q] 3G or Wifi?

Which is better for the batterylife, 3G or Wifi?
At home and at work I'm connected to Wifi, but yesterday I noticed when I turned off Wifi and used 3G instead 3G seems to use less battery. However, this could also be because of several wakelocks I had when I was using Wifi.
I would understand Wifi is better for heavy internet use and 3G for push messages, but I couldn't find an answer anywhere on the forum, sorry if I missed it.
Bommeke said:
Which is better for the batterylife, 3G or Wifi?
At home and at work I'm connected to Wifi, but yesterday I noticed when I turned off Wifi and used 3G instead 3G seems to use less battery. However, this could also be because of several wakelocks I had when I was using Wifi.
I would understand Wifi is better for heavy internet use and 3G for push messages, but I couldn't find an answer anywhere on the forum, sorry if I missed it.
Click to expand...
Click to collapse
Hi there!
Wifi uses a lot less battery life, especially if you browse or do anything.
Having wifi ON always uses a certain amount of battery life, now, if you're receiving emails, downloading, browsing, it easily makes up for it. The reason for this is that Wifi is a "local" communication signal. It's for short distances, therefore your phone doesn't have to emit that strong of a signal, nor does it use up that much battery to receive. So Wifi is the way to go if you're just going to use it even a little bit.
3G uses more energy because of the radio spectrum itself and the distance and having to maintain it. It's true while having wifi you also maintain 3G, but you're not emitting constant data, it's just the "I'm still alive" packet to your operator.
Summary:
Use wifi if you're going to use your phone on the internet even a little bit. Turn it off when you don't have wifi near you, otherwise it'll be looking for a new wifi hotspot and that'll drain some battery.
Don't use wifi if you're not home.
Thanks for the clear answer!
Glad to have helped
New problem
The last 2/3 days my batterylife decreased. My phone was awake most of the time even though the screen was off and this hadn't happened before. After installing BetterBatteryStats (BBS) I could see the process wlan_rx_wake was on top (about 6,5 hours of the total 10 hours the phone was on).
My first thought was some app was responsible for this, however when I turned off Wifi and started using 3G again my batterylife seems to be normal again. Checking BBS the wlan_rx_wake seems to be renamed to deleted_wake_locks.
The last things that changed just before the problems started occurring was installing the Facebook and Twitter app, and updated to the latest ICS Vertumes theme (I was on 1.5 and now I'm on 1.6). So I uninstalled the Facebook and Twitter app but this didnt help at all. I already uninstalled Google Maps. The only thing I haven't tried yet is changing to the original theme, but it doesn't make sense this could be the solution.
Any ideas?
I had the same problem with the twitter app, it kept waking my device so i uninstalled it and use Ubersocial now.
I use Juicedefender (Ultimate version if you want to pay)
Juicedefender can turn off your wifi and 3g when your screen is off. It can be set to ping your data/wifi every few minutes if required to check emails tweets.
But Twitter nor Facebook is the problem. When uninstalled the problem still exists. Dont want to turn off wifi or 3G when the screen is off as then my mail or whatsapp wont sync.
Read something that it could be the type of router, but this isn't it as well. I've got the problem at home, work and at my parents house. All different routers.
Think I might just do a full-wipe and hope that solves it..
Before you do a full wipe try freezing Wifi Sharing and Wifi Sharing Manager with Titanium or Bloat Freezer Free to see if that makes a difference.
Sorry I recognize twitter was not an issue for you, it was the app that first alerted me to my issues about the wakelocks
LocationManagerService
Hmm... LocationManagerService is active over more than 4 hours. What could that be? GPS and the Google location stuff is already disabled..
logout of maps and check if that helped.
---------- Post added at 12:22 AM ---------- Previous post was at 12:17 AM ----------
wakelocks by apps that needs to sync can still be left even if u have deleted the actual apps that's requesting on-line data.residuals i would say.but try to check each and every apps that you have installed and see if they have sync or update requests and prolly modify them to manual.see also if ICS has a push notification request like "send errors to" or "check updates"
3G ofcourse
Maybe it's the kernel. Currently using Speedmod K2-18-test12. Lost 50% battery during the night. The phone wasnt awake but didnt enter deep sleep either.
Will try Speedmod K2-18-test16 next. If that doesnt solve it I'll try a whole different kernel.

[Q][View] Battery/Screen Question

Hello, everybody. Newb here (only have had the HTC Evo View 4G for a couple of days now). I have a question about the battery and screen. Is it regular for the screen to use up about ~60 percent of the battery? (According the usage stats). I find that the screen is bright, even on the lowest setting.
Also, I have a question about the battery. It seems to be draining a little quick (I am using lowest brightness and WiFi only). Could some people share how long their battery usually lasts for regular usage? I don't think it's a hardware issue. Like I've said, I've only had it for 2 days, so I don't know if I still need to wait a little.
Thanks!
The screen is one of the biggest battery drainers (if not the biggest) on tablets. So if you are using the tablet a lot, and the screen is on for long periods of time, then 60% seems normal. I don't have my Flyer with me right now to check what my % for screen is.
Battery drain is going to depend a bunch on how much you are using your View, and for what. With moderate usage, I can get around 2 days on a charge. I'd say that is about average for me. But if you are downloading big files and gaming, and/or have the screen on a lot, it can be significantly less.
redpoint73 said:
The screen is one of the biggest battery drainers (if not the biggest) on tablets. So if you are using the tablet a lot, and the screen is on for long periods of time, then 60% seems normal. I don't have my Flyer with me right now to check what my % for screen is.
Battery drain is going to depend a bunch on how much you are using your View, and for what. With moderate usage, I can get around 2 days on a charge. I'd say that is about average for me. But if you are downloading big files and gaming, and/or have the screen on a lot, it can be significantly less.
Click to expand...
Click to collapse
Okay, that makes sense. The battery life seems to be getting better. One more question. I want WiFi to turn off after a certain amount of time once the screen timeouts. Is there any way to do this in the settings or with an app? The settings (official 3.2) has a WiFi timeout policy that gives three options:
Switch from WiFi to mobile data when screen is off
Never switch WiFi off
Never switch WiFi off when plugged in
I live in Canada and don't have a plan. Would using the first option drain more battery because it is looking for a connection? Or should I use the third option?
Thanks again.
Hmm, not sure. I have the WiFi only version of the Flyer, and on mine the first choice is just "When screen turns off". The first choice on your View is weird. Mobile data always uses more power than WiFi, if both are available. I don't see why you would ever want that.
BTW, I'm at home and have access to my Flyer now. Battery usage for screen is 52% for me. So I'd say 60% you mentioned is pretty normal.
You should also take into account, unless you've taken steps to turn it off/remove it, Cell standby might also be causing your battery life to take a hit. Since the View is set up to also be able to receive text messages, out of the box it's constantly trying to connect to Sprint's cellular network, even if you have mobile data turned off. This thread discusses ways to deal with it. Cell standby used to be one of the biggest users of my battery. Now, it's no longer a problem and I've seen a major increase in battery life.
As for the WiFi issue, the first choice in the settings actually says "When screen turns off (uses more mobile data)." That doesn't mean that it automatically switches mobile data on if you've turned it off in the settings by selecting that option. It's worded that way because the View is designed to be used on Sprint's network, so under normal circumstances it is assumed that if you turn WiFi off, you'll have a data plan and automatically connect to the mobile data network. If you don't have an account with mobile data from Sprint, and you've turned off mobile data in the settings, it won't be an issue because you have nothing to connect to.
bsweetness said:
As for the WiFi issue, the first choice in the settings actually says "When screen turns off (uses more mobile data)."
Click to expand...
Click to collapse
That makes much more sense.
Okay, thanks everybody. I really appreciate it. With heavy usage (basically using it all the time) I'd get about 6 hours and 10 minutes. Is that normal for everybody else?
Also, I have a couple of more questions, if you guys don't mind.
First of all, could rooting my device boost my battery life? Would it give me more access to settings like screen brightness?
And, do apps running in the background use battery life or are they 'frozen' until active? This sort of leads me into my next question. Is having 400-500MB of RAM always being used normal? Is the OS using all of it?
And I notice that when I put my tablet in airplane mode (to kill the 4G radio) I lose access to Bluetooth. Is this normal and will turning off airplane mode for a minute be a battery drain?
Thanks again, guys.
nubyw00tz said:
Okay, thanks everybody. I really appreciate it. With heavy usage (basically using it all the time) I'd get about 6 hours and 10 minutes. Is that normal for everybody else?
Also, I have a couple of more questions, if you guys don't mind.
First of all, could rooting my device boost my battery life? Would it give me more access to settings like screen brightness?
And, do apps running in the background use battery life or are they 'frozen' until active? This sort of leads me into my next question. Is having 400-500MB of RAM always being used normal? Is the OS using all of it?
And I notice that when I put my tablet in airplane mode (to kill the 4G radio) I lose access to Bluetooth. Is this normal and will turning off airplane mode for a minute be a battery drain?
.
Click to expand...
Click to collapse
Answers:
Rooting won't necessarily boost battery life, but does give you ways to access more system items if you want using apps that take advantage of root.
Android attempts to keep non-rumming apps in memory so that it can load them faster in the future (Ram is much faster than SD memory). 80% Ram full is typical.
Airplane mode turns off all radios, BT, Wifi, GPS, 3g.
There are apps in the market that can turn various things on / off based on your environment / time / conditions
nubyw00tz said:
First of all, could rooting my device boost my battery life? Would it give me more access to settings like screen brightness?
Click to expand...
Click to collapse
You don't need root access to adjust screen brightness. Settings -> Screen -> Brightness.
nubyw00tz said:
And I notice that when I put my tablet in airplane mode (to kill the 4G radio) I lose access to Bluetooth. Is this normal and will turning off airplane mode for a minute be a battery drain?
Click to expand...
Click to collapse
DigitalMD said:
Airplane mode turns off all radios, BT, Wifi, GPS, 3g.
Click to expand...
Click to collapse
Airplane mode turns off all radios initially, but then you can turn almost all of them right back on (except for the cellular radios). I run mine in airplane mode all the time to keep the cellular radio completely inactive, but I still use WiFi, GPS, and Bluetooth when I need/want them, and they all work great. Are you running Gingerbread or Honeycomb? I do seem to remember some mentions of not being able to use Bluetooth in airplane mode on Gingerbread. It works perfectly fine on Honeycomb.
And you can turn off the 4G radio and all data service without turning on airplane mode (Settings -> Wireless & networks -> Mobile network). Doing this turns off all radios that receive data from the cellular network, but it doesn't turn all cellular functions off since the View is also set up to receive text messages. That's what airplane mode or any of these options address.
What I meant by adjusting the screen brightness was being able to control its range more than I can right now (I feel that even the lowest setting can be too much). But it seems that rooting/installing a custom ROM wouldn't do too much for the battery.
But my issue with airplane mode is that I can't turn on Bluetooth with it (Bluetooth is 'grayed out'). I am running official Honeycomb.
nubyw00tz said:
But my issue with airplane mode is that I can't turn on Bluetooth with it (Bluetooth is 'grayed out'). I am running official Honeycomb.
Click to expand...
Click to collapse
Did you try tapping on the box for Bluetooth in the settings even though it looks like you can't, and did you try using a widget to turn it on? I'm using stock OTA Honeycomb, and Bluetooth works perfectly fine for me while in airplane mode. I can turn it on in the settings (the box does look a little "grayed out," but you can still select it) or via a homescreen widget. If you can't turn it on with either of those, then it would seem that you've got some other type of problem. It works fine for me. I just tested it out again.
bsweetness said:
Did you try tapping on the box for Bluetooth in the settings even though it looks like you can't, and did you try using a widget to turn it on? I'm using stock OTA Honeycomb, and Bluetooth works perfectly fine for me while in airplane mode. I can turn it on in the settings (the box does look a little "grayed out," but you can still select it) or via a homescreen widget. If you can't turn it on with either of those, then it would seem that you've got some other type of problem. It works fine for me. I just tested it out again.
Click to expand...
Click to collapse
I just tried it. It seems to not be working for me, but it doesn't seem like a glitch but something built into the OS (I tried with a widget and it did a little 'no' animation). It's alright, I rarely use Bluetooth anyway.
Thanks for all of your help (plus everybody else, too)!
nubyw00tz said:
I just tried it. It seems to not be working for me, but it doesn't seem like a glitch but something built into the OS (I tried with a widget and it did a little 'no' animation). It's alright, I rarely use Bluetooth anyway.
Thanks for all of your help (plus everybody else, too)!
Click to expand...
Click to collapse
I'd venture to say it's not something built into the OS. If it is built into the OS, then there's a glitch that allows me to use it under the same circumstances, and glitches rarely enable functionality. They almost always cause a device to lose functionality like you're experiencing. I'd be curious to know if anyone else is having the same issue you're having.
Last time I have ran battery test on my Flyer I ran it for almost 11 days on one charge. Yeap, 11 days. I mostly used Flyer as a notepad, checked orders on website couple of times a day, read emails. One day I played a game for about 20 minutes. At the end I set up and tested Plex and Google Music. I stopped the test at 11% charge. Overall screen was on for a bit over 4 hours (40%). Wi-fi on for 16 hours (only 4% ??) according to stats. That's pretty much it. Tablet idle 43%. Fairly light usage, but I mostly was testing how much of useable time I can get out of it. 11 days is a pleasing result.

[Q] Verizon Galaxy Tab 10.1 LTE ICS

I have been searching through the two or three threads of ICS ROMs that support the Verizon LTE Tab. Unfortunately I am unable to find an answer if any of the ROMs once installed will retain mobile network functionality 3G/4G. If I flash any of these ICS ROMs am I turning my Tablet in to basically a Wifi-only tablet?
Thank you.
No modem support yet for our Verizon versions of the tablet so yes essentially you will turn the tab into a wifi one without working cameras as well.
Thank you very much.
muzzy996 said:
No modem support yet for our Verizon versions of the tablet so yes essentially you will turn the tab into a wifi one without working cameras as well.
Click to expand...
Click to collapse
What do us Verizon tablet owners do about the modem then? My tablet continues to be plagued by cell standby problems and I am running the latest version of CM10 nightly 2012.11.19. If I toggle the tablet into airplane mode and turn the wifi on, the battery status still shows that the cell is on and drains the battery very quickly.
When I've tried to flash the p4wifi version it fails out.
Is there anything I can do to get this cell standby problem fixed?
apexjr said:
What do us Verizon tablet owners do about the modem then? My tablet continues to be plagued by cell standby problems and I am running the latest version of CM10 nightly 2012.11.19. If I toggle the tablet into airplane mode and turn the wifi on, the battery status still shows that the cell is on and drains the battery very quickly.
When I've tried to flash the p4wifi version it fails out.
Is there anything I can do to get this cell standby problem fixed?
Click to expand...
Click to collapse
Probably would have been more appropriate to start a new thread than hijack this one. This thread was looking to find if any ICS based ROMs supported the SCH-i905 back in April of 2012. Fast forward to now and your issue is battery drain on CM10 which now supports the SCH-i905.
NEVER flash other versions, stick with versions specifically built for the SCH-i905 if that's your device. Flashing other things can yield to a bricked tab.
To answer your question; not completely no. Simple answer isnt it. And yes it sucks big time. Wakelocks on CM10 are a big issue for various devices and coupled with LTE causes major battery drain for multiple devices. All that can be done at the user level for now is to minimize wakelock issues manually by developing the habit of turning off various things when not in use prior to putting the tab to sleep. It's a pain in the butt but your alternative is to go back to stock touchwiz ICS if you wish.
What I've done is created TB shortcuts on desktop to disable maps and talk . . a secure settings toggle shortcut to turn off location services . . and developed a habit of turning on airplane mode prior to putting the tablet away. I've installed better battery stats to monitor application processes and identified wakelock crazy apps like Facebook etc. and uninstalled them.
This maximizes battery life but it doesn't always result in the tablet going into deep sleep consistently. Often times after a period of heavy use there will be various applications cached on the tab and it will fail to enter deep sleep when left in standby. So, if I know I'm going to be putting the tablet away while not plugged in for an extended period I find it best to do all those things outlined above and then reboot the tab. This clears out all cached applications and results in the tab deep sleeping for hours on end.
I've tried automating these things using Tasker but that application hasn't been playing nice with CM10 for me and often times my airplane mode script would run during use of the tab even though the script should have only run when the tab was on standby for more than 10 minutes.
For now I've disabled tasker and I just manage the tab manually.

battery drains alot when using wifi ?!

hey, i've read a lot about this problem and tried all the possible fixes but nothing works
some weeks ago i got a new router but i'm not sure if this problem started when i put the new router (asus rt-n56u) on work because i also got a huuuuuge battery drain with sensation 4.1 (rom) and could never get back to the battery stats i got with alliance rom before.
after flashing many different roms and kernels (also with repartition in odin) nothing helped and so i decided to look up on xda again. i installed betterbatterystats and when i saw the results i was really happy because the problem could be narrowed down to wlan_rx_wake and wlan_wake. the solution that was given is to give the s2 a static ip. i did this (configurated the router and the network config in the s2) but unfortunatly it didn't help
now i'm completly stucked and dont know what else i could do. when i'm on wifi the battery drain is heavier than on data mode (3g,h+).
is there any solution without changing the router (i cant since i'm living with many other person in a house; fw is custom - 3.0.2.6-018) ??? problem is definitely the wifi connection and static ip didn't solve it :-S
i will add betterbatterystats screen later today.
no solutions ?
(screens will be added in the evening)
what didnt work:
- setting static ip in the router and also in smartphone
- disabling services in in windows
- reboot everything
- flashing different kernels/roms (ics and jb)
--> disabling wifi gets me back to normal battery behaviour but i need wifi.
okay, as what i know, wifi connection is somehow "kernel related" so if flashing another kernel does do any good to solve your problematic battery drain, then i must suggest you flash a stock ROM to get the hold of everything, do a factory reset and start from scratch, also calibrate your battery..
from there, you should do some mega-tweaking xD
as i've written before i tried many different rom-kernel combos (sammy based and aosp, ics and jb, stock and custom). there all have the same problem and from what i've read this problem is router related but all given solutions are not working.
so i need some other suggestion (and i cant change the router since there many other person in my house)
so seems like i found the problem but its not easy find the right settings, however, here is the important part :
The DTIM is how the AP (wireless router) warns its clients that it is about to transmit the multicast (and broadcast*) frames it queued up since the previous DTIM.
This queueing and scheduled delivery is done to allow power-conscious devices to save power by turning off their receivers for brief stretches of time, only waking up their receivers when the AP indicates is has traffic for them. This procedure is only performed if one or more of the currently-associated clients on the AP is in power-save mode. If no clients are in power save mode, the AP will transmit multicasts as soon as they come in.
The DTIM interval is essentially meaningless and can be safely ignored. A shorter DTIM interval could theoretically make your wireless devices use up their batteries faster, because they'd have to wake up more often for multicasts. A longer DTIM interval could theoretically hinder multicast performance on your network. But either way, it is extremely unlikely that you'll be able to notice any difference that the DTIM interval setting makes. You'd have to set up a special, sensitive test to look for any difference, and I'm still not sure you'd be able to reliably measure one.
*in 802.11, broadcasts are a subset of multicasts, so wherever I wrote "multicasts", you can read it as "multicasts or broadcasts".
Click to expand...
Click to collapse
source: http://superuser.com/questions/1762...m-do-and-can-it-increase-wireless-network-per
so you should try to raise the dtim interval if your router let you do this and see how it works.
note: too low - battery drain could be extremly high ; too high - you connection could be really unstable (keeps connected but you cant access internet with any app)

Idle is draining battery

Hello,
I have the following Problem, while in Idle the phone is consuming so much battery, any help ?
push
Which ROM release are you on?
I am on Stock Rom and have the latest ota 15.07
dafuq2111 said:
Hello,
I have the following Problem, while in Idle the phone is consuming so much battery, any help ?
Click to expand...
Click to collapse
There are quite a few threads on this already including what I wrote (pasted below).
<<<<
I had two types of standby battery drain - mobile data and wifi. I have fixed both of them through lots of trial and error. From my testing and looking on XDA at similar experiences of people on other phones, these are bugs in Android rather than anything Elephone can fix through updates (I'm on the latest 20160419 update).
I fixed the mobile data problem by creating Tasker profiles to keep the phone on 2G whilst it's connected to wifi. I can't post links yet but a search on XDA/Google will find you these profiles. Maintaining a 4G connection is unnecessary whilst on wifi, besides, some people have problems receiving calls on this phone whilst on 4G. If the phone is not connected to wifi (rare in London because it's everywhere even on public transport) 4G comes on. Best of both worlds.
The wifi drain solution sounds counterintuitive but it is simply to set it to 'always on'. With both of these measures, my standby drain has been 1% overnight for the last two nights and roughly 0.25%/hour during the day. Standby drain on 4G whilst moving around London with location on at least quadruples battery drain to around 1-2%/hour.
Some of my other settings will have an impact too. I find the auto-brightness calibration of the P9000 poor, so adjust brightness manually (which also saves battery life). NFC, bluetooth, etc. I only turn on when needed. I use Greenify and have all apps Greenified except Tasker, Textra, and Hangouts. I haven't Greenified any system apps except Google Maps. Location is always on but mostly device only (again counterintuitive, you'd expect it to be 'battery saving') unless I am moving around in which case I have a Tasker profile to automatically switch it to 'high accuracy'.
I tried to get Xposed working so that I could use Amplify too (see my other post) but that didn't work. Since I'm very happy with battery life now that's not that important anymore though it would be nice for the further tweaks it makes possible.
There are too many other variables to list and everybody's phone is set up differently. However, hopefully using some of the main big gains I've listed above you can fix your wifi drain specifically and improve standby drain generally.
Well, it's somewhat problably what keeps the phone awake, this occurs after factory reset, i already did the Tricks you've listed and on screen Features and so on are all off, there are no Apps who should keep the phone awake Cause it's happening Straight after factory reset so there are no other Apps..
Push
Finger print sensor or DT2W for sure. Disable them
On the latest ROMs it is the finger print sensor. Turn it off or go back to 20160810

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