Samsung Captivate : WiFi Connection Turns Off When In Sleep Mode By Default
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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Sep 14, 2010
When I select the power button to bring the phone out of sleep the phone screen will turn off within a second or two. Is there a way to keep the screen on longer? If I press power and look away for a second the screen goes black again. Its liek I have to hit power and jump right on it to enter my swipe code.
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Aug 30, 2010
Looking for an app or widget that will automatically disable 3G and change my phone to 3G (Edge) when the screen is asleep or I press the lock button.and the re enables when I unlock.
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Sep 9, 2010
I've noticed when the phone goes into standby mode (press the right power button), the 3G eventually turns off. Is there a way to prevent that from happening? I'm assuming I can't get any notifications (i.e. Instant Messenger clients, Google Voice, etc.) while the 3G is off, but not sure. I'm also assuming 3G goes into sleep mode, as when I power the phone up I don't see the 3G icon (is that assumption correct?).
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Aug 26, 2010
I got the samsung captivate for AT&T a couple of weeks ago and have run into a few problems with it:
1) Wifi worked great for a while, but now it says unable to scan for networks and turns the wifi off...this wouldn't be too bad if I had a big data plan but I do not.
2) Battery Life...fml
3) I cannot find ANYWHERE any supporting software to sync media files with my PC
4) The drivers will not install on my computer
5) Way too many apps are using data without me even opening them (navigation, yahoo mail etc...) I have AdvAppKiller but that gets old
It is wonderful having such a wonderful, fast device with 16 gb of memory, but these shortcomings are making me realize why I enjoyed a flip phone for so long.
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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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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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Jul 25, 2010
I just got my captivate a couple days ago and I am having issues connecting my phone to my WiFi at home. I successfully connected to my home WiFi when I first started my phone but now it always says "connection unsuccessful".
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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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Jan 5, 2010
I apologize if these topics were already covered in previous threads.I wasn't able to find anything related in my searches. Auto-rotation for keyboard when answering a text message received in sleep mode does not work. If I actively send a text when phone is already awake, keyboard rotates with no problem but when I go to reply to a text that I received while phone is in sleep mode, the keyboard does not rotate. Is this the norm?I am also experiencing a delay when the I wake the phone. After unlocking the phone, I used to go straight to my home page, now I get a "loading" message which takes several seconds. Is this due to the number of apps I have loaded? Is it possibly due to number of photo frames I have on my home screen or the complexity of the wallpaper?
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Jun 4, 2010
I installed juice defender this morning then deciding i didnt want it i uninstalled it, since then my wifi keeps going into sleep mode after about 15 mins which i dont want. before i installed juice defender it just stayed on all the time so i got notifications etc. ive reinstalled juice defender and disabled all its features as far as im aware but wifi is still going into sleep mode. what can i do to get my wifi back on all the time.
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Jun 14, 2012
I have a smartq t20 tablet (great cheap tablet!) running ICS, my question is, when I leave wifi on all the time, what happens when the tablet goes to sleep (not awake according to the battery details)?I can leave a download running and it would continue when the screen is off, does this mean my tablet is never going into deep sleep? Or is that unrelated?
I know the wifi itself drains more battery when left on even if it isn't being utilized but I was wondering about the CPU side of it.
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Sep 4, 2010
My wifi will turn on, but will scan for or connect to networks. Anyone had this issue and know how to resolve it?
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Oct 6, 2010
I have a service which polls a server at certain intervals. I use an AlarmManager and a BroadcastReceiver to start the service. My problem is that after a certain duration, even though the WiFi is still enabled, but for some reason, my application can't contact the server. I get an "Unreachable network" error. Note that I've already acquired a partial wake lock as well as a wifilock. Here's my code for the BroadcastReceiver.
public class ServiceAlarmBroadcastReceiver extends BroadcastReceiver {
public void onReceive(Context context, Intent intent) {
WakeLock wakeLock = null; WifiLock wifiLock = null;
try { PowerManager pm = (PowerManager) context .getSystemService(Context.POWER_SERVICE);
// acquire a WakeLock to keep the CPU running
wakeLock = pm.newWakeLock(PowerManager.PARTIAL_WAKE_LOCK, "MyWakeLock");
if(!wakeLock.isHeld()){ wakeLock.acquire();
} Log.i("ServiceAlarmBroadcastReceiver", "WakeLock acquired!");
WifiManager wm = (WifiManager) context.getSystemService(Context.WIFI_SERVICE);
wifiLock = wm.createWifiLock(WifiManager.WIFI_MODE_FULL , "MyWifiLock");
if(!wifiLock.isHeld()){ wifiLock.acquire();
} Log.i("ServiceAlarmBroadcastReceiver", "WifiLock acquired!");
context.startService(new Intent(context, ThePollerService.class));
} finally { // release the WakeLock to allow CPU to sleep
if (wakeLock != null) { if (wakeLock.isHeld()) {
wakeLock.release(); Log.i("ServiceAlarmBroadcastReceiver", "WakeLock released!");
} } // release the WifiLock if (wifiLock != null) { if (wifiLock.isHeld()) { wifiLock.release();
Log.i("ServiceAlarmBroadcastReceiver", "WiFi Lock released!"); } } } } }
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Dec 3, 2013
My android 4.1.2 really turns off the wifi when in sleep mode. I see it in the battery monitor.
But after I formated the cellphone, It started with the bug of not turning off the wi-fi in the sleep mode, even when set to do it Maybe some app that I installed before has changed some internal settings!
Before, my battery was lasting almost 4 days, I not use it too much, but now it lasts 2 days only... and I have sure that it's because of the wi-fi bug.
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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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Jul 1, 2010
i have the moment and pressing the red hang up button will turn the screen on when its in sleep mode, but when i press it again to turn the screen off it wont, it has to time out. now the button still works to end calls and if i press and hold it will bring up the shut down window but like i said it wont just turn the screen off i have to wait for it to time out each time. is this a hardware problem or what is wrong.
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Oct 2, 2010
My captivate turns off after a period of non use during the day. Is there a fix?
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Jul 28, 2010
Anyone else have a problem where their phone turns off and on and off abd on... My does it about once a day. I have to pop the battery to stop the cycle.
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Sep 7, 2009
If my screen locks while I have a wifi connection, then the connection is lost when I unlock the phone.First, is this perhaps deliberate, to save power? Also, either way, when I unlock the screen and go into wifi settings, I see that the phone is trying to make a wifi connection, but it never succeeds, even though it's my home network and I'm in the same room as the router. It just states 'Obtaining address.
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Jul 11, 2010
I connect to wifi at home. however, when the phone goes into screen safe mode, the wifi icon is not there. only after i swipe the phone to get back to the menu, then i see the wifi icon.
does it mean wifi is disabled when the phone is in screen safe mode? it appears i do not always get notification for new text when the mode is in screen safe mode. it's sporadic.
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Sep 15, 2010
Long time reader, first time poster here. How does one know if the Epic is using the wifi connection as opposed to using the 3G connection? When wifi is connected both that and the 3G connection shows at the top. So which one is in control per se? And how can it be verified?
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Sep 25, 2010
Just a quick question for everyone that has done the OTA update. Is your Wi-Fi- working. Mine will not scan for networks and just turns the wi-fi- off.
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Aug 8, 2010
Is it possible to have the screen only come during turns similar to TeleNav? This is a big plus for TeleNav if it doesn't. The battery saved is tremendous.
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Sep 30, 2010
Until yesterday if I had an app like Pandora or ESPN Radio playing/running when the screen kicked off the app would keep playing. However, now when the phone goes to sleep everything else gets shut off. I have not altered anything myself per se. Even uninstalled a few apps like AutoKiller [which I had installed for weeks and everything worked fine with it on and installed] but the problem persists and remains. This really perplexes me as I want/need these apps to play with the screen off like they did before. For the life of me I don't know why this is; nor can I find anything in settings to change.
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Apr 26, 2010
Is there any difference between locking the screen (screen being off) and "sleep mode"? If there is, is there a way to force not to go into sleep mode, but have the screen off?
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Sep 25, 2010
Just bought a Vibrant off of CL. I got it unlocked and it seems to be running well off of AT&T. I had a few questions though.
1) Whenever it is in the sleep/standby mode it will randomly flash on. I won't get any new emails or txt messages but it does stay on for a while until the screen timeout period ends
2) It does display a "Refreshing SIM data" message at the bottomish area every few minutes. Is this normal or is this an AT&T thing...
3) I was able to reset everything from going to the Settings>privacy>factory data reset but the instructions for a hard reset of "turning on the phone while holding down the volume down button" did not work. Has anyone been able to pull this off?
All in all I'm pretty jazzed about the phone. I like the Swype typing a lot as well as the overall speed and app installs. I'm coming from a work iPhone and an old school bar phone that could only call and txt. My wife has a iPhone4 and even though the facetime feature is nice I still don't like the restrictiveness of Apple products.
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Jul 18, 2010
Anything you guys can think that could help? I've searched around, and found that holding down VOLUME DOWN and Power lets you hard reset the phone, but this doesn't work for me. I hold them down, and the phone just boots up like normal and then shuts off.I rooted it, and it was working fine. Rebooted a few times and then it quit working.
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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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Aug 4, 2010
Noticed since I work in a rather quiet environment. During office hours I need to keep it on vibrate mode. When the phone vibrates during a call, it causes a severe rattling noise when the phone is in my hands or if the bottom is not resting against a hard object. Removing the battery compartment cover and repeat, and the rattle is non existent. With the battery cover on, the rattle can be diminished by pressing firmly on the top section of the cover.
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