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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.
Hi Guys,
I have recently installed whatsapp on my HTC Titan, - its a great app, has drastically reduced my international call and text cost.
How ever the battery life of my phone is taking a huge hit. i am talking about 7 hours total from full charge - when i engage in continuous chatting on the app.
Is anyone experiencing any similar issues? - will be grateful if any one can help figure out the reason for the drain
Cheers
JP
jpmalum said:
Hi Guys,
I have recently installed whatsapp on my HTC Titan, - its a great app, has drastically reduced my international call and text cost.
How ever the battery life of my phone is taking a huge hit. i am talking about 7 hours total from full charge - when i engage in continuous chatting on the app.
Is anyone experiencing any similar issues? - will be grateful if any one can help figure out the reason for the drain
Cheers
JP
Click to expand...
Click to collapse
Yes, this is because Whatsapp is continiously checking for new messages using your cellular connection. This means the modem is ALWAYS engaged, and you're practially always connected.
Some random website gave call time spec: Up to 6 h 50 min (3G)
This seems about right with your battery usage.
Being connected with 3g basically counts as talk time, Since the mic and speaker are the least of your worries battery consumtion wise.
Normal synchronisation like email is set at 30 minute (customizable) intervals.
This saves a lot of battery power.
Basically, this goes for any app that uses a continious internet connection (e.g. browser, ad supported app, online navigation, chat.)
Note that in some research a while ago someone tested battery usage in games, and it turns out that displaying ads uses more power than running the game itself (assuming the game is off-line).
http://research.microsoft.com/en-us/people/mzh/eurosys-2012.pdf
Whatsapp is one of those apps that uses continious internet connection.
Also recieving email's "as they arrive" also drains power. So does facebook/messenger chat and any app that refreshes their data in the background frequently OR that is ad supported.
I'm using whatsapp, receiving messages during all the day and my battery stands with no problem until night, 16-18 hours. I think that the battery problem is more related with the time you are writing messages, with the screen, our huge screen, on.
I have had Whatsapp on since day 1 and never had any issues with battery and Whatsapp.
If you do continous chat for 6-7 hours I think your culprit is your screen brightness and CPU that keeps your phone locking and unlocking! I get occassional messages on Whatsapp throughout the day and I manage to reply them whenever I have some spare time. Same with emails.
You can even try anything that will keep your phone "awake" in foreground i.e. keep communicating via emails or e-books with screen on and data on - you will have battery drain.
But same activity on intermittent basis will not cause this drain.
Also, your network coverage - the farther you are from the network masts, the quicker you will drain your phone. Sadly we can't do much about it unless you live in a super-connected area.
@jpmalum: are you using push notifications?
@kpn: actually, WP7 has a completely different background processing policy compared to Android. Incoming notifications flow through MS's push notification service which greatly reduces network access. Periodic polling by apps is restricted to intervals of 15 minutes minimum, and device wakeups for different apps are coalesced to avoid each of them generating its own 3G tail like on Android.
Also, KPN should really fix their network settings, tail times on the KPN network are ridiculous, the modem stays in FACH for up to a full minute! I am aware that this is probably better for browsing but come on, a _minute_, really?
I have some power traces from a Galaxy Nexus with a background process doing some network stuff once per 5 minutes. On KPN, the app uses 277.59J/hour, versus 182.05J/hour and 205.47J/hour on TMobile and Vodafone respectively. The difference is not due to signal strength, but comes purely from tail time. Hopefully fast dormancy and the new enhanced FACH state will fix this in the future, but they require carrier support to work.
(full disclosure, I'm a PhD student doing research on mobile phones)
I just wanted to post on the XDA forums that there is a thread to help determine what is causing the "heat + battery drain" issue(s) on the Lumia 920.
http://discussions.nokia.com/t5/Nok...n-ATT-Overheats-Battery-Draining/td-p/1606012
Specifically, we've seen fairly normal battery drain when using applications, but when LTE data is introduced the battery continues to drain at a rate of 7-8% per hour even after the applications are closed. For example, streaming something like Xbox Music or Netflix over the LTE connection (wifi OFF), the phone warms up considerably and the battery continues to drain at a high rate even after those applications are closed. The same applications behave normally over 3G or Wifi, and the battery drain is not present afterward.
The "fix" so far appears to be disabling LTE altogether.
• Open Dialer
• Punch in ##3282 and hit Call
• At the Field Test menu, choose more options via the three dots (lower right)
• Select Settings
• Under network type, select "3G only". UMTS should be set to "Automatic".
• Change the "Toggle ENS" setting to OFF
• Back out, power off the phone, and power on again
Definitely interested in hearing other's reports on this issue. Specifically, does this happen with ALL Lumia 920 phones? Is this specific to this particular model phone? Is this a Nokia issue, LTE chip issue, or WP8 issue? Was this introduced with the Portico update?
Thanks.
Upon further testing.........
Disabling LTE is *not* the ultimate fix. Yes, it does help keep the battery drain down to more reasonable levels, but it does not solve the problem. I've subsequently tested with the little brother phone -- the Lumia 820 -- to see if the issue is on all WP8 handsets, on all Lumia phones, or even limited to post-Portico update phones (in other words, did Portico make this issue).
After some thorough testing, I can say with confidence that this issue is specific to the Lumia 920 and not necessarily all WP8 handsets or Lumia phones.
Detailed thread here: http://discussions.nokia.com/t5/Nok...Overheats-Battery-Draining/m-p/1795212#M43837
I am currently working with Nokia to find a long-term resolution to this issue.
Please keep us updated, I'm very interested in knowing how to fix this problem! ??
I found that disabling bluetooth helps out.
Battery drain
To help reduce battery drain I do the following on my WP
I get a connectivity shortcut app. There are a few options available in the store. Anyway I pin airplane mode, Bluetooth, Wi-Fi, and Location on my home screen and turn them off when I'm not using them. Turning off location turns of GPS, so you must enable it before launching Drive/Here. A lot of battery issues I think have to do with the phone being to aggressive (power wise) trying to search for signal. Whether its Wi-Fi a Bluetooth device, etc. I also disable Tap+Send (NFC) because I never use it.
And I go into background tasks and I block every single app from running in the background except the ones I am sure I want to run. Remeber the list where you can block them is for apps that want to run on a timed schedule, they can still run in the BG if you home screen out of them. For me the only one I allow is MS Weather (for the live tile). Disabling Nokia Drive/Here seems to help battery life for some people.
The biggest battery saver I did was forwarding my other email accounts (Gmail & Yahoo!) to Outlook.com, and then set that to only look every 1 hour (instead of the stock 30 minutes). My phone went from lasting 1 - 1.5 days to over 2.5 - 3 days with my typical usage (light usage).
I try not to use Live Tiles, or lock screen pictures unless I really want them (like weather for instance), as they help drain the battery quicker.
Anyway Nokia is really on top of their game so I think they will help contribute to WP to eliminate these issues. The only non-software related issue with the 920 is the dust in the FFC, which personally does not bother me but I could see how it might bother others.
##3282 isn't working for me after yesterday's update. Lets see how I do with the battery today!!!
The earpiece on mine does not work I can't hear anyone and top of phone gets warm I have sent it to nokia repair.
yipcanjo said:
I just wanted to post on the XDA forums that there is a thread to help determine what is causing the "heat + battery drain" issue(s) on the Lumia 920.
http://discussions.nokia.com/t5/Nok...n-ATT-Overheats-Battery-Draining/td-p/1606012
Specifically, we've seen fairly normal battery drain when using applications, but when LTE data is introduced the battery continues to drain at a rate of 7-8% per hour even after the applications are closed. For example, streaming something like Xbox Music or Netflix over the LTE connection (wifi OFF), the phone warms up considerably and the battery continues to drain at a high rate even after those applications are closed. The same applications behave normally over 3G or Wifi, and the battery drain is not present afterward.
The "fix" so far appears to be disabling LTE altogether.
• Open Dialer
• Punch in ##3282 and hit Call
• At the Field Test menu, choose more options via the three dots (lower right)
• Select Settings
• Under network type, select "3G only". UMTS should be set to "Automatic".
• Change the "Toggle ENS" setting to OFF
• Back out, power off the phone, and power on again
Definitely interested in hearing other's reports on this issue. Specifically, does this happen with ALL Lumia 920 phones? Is this specific to this particular model phone? Is this a Nokia issue, LTE chip issue, or WP8 issue? Was this introduced with the Portico update?
Thanks.
Click to expand...
Click to collapse
Thanks for the tip!
I also have 5-8% per hour drain. (actual offi. release .1308...)
all off, sync, loaction, WLAN every thing, fresh reboot, phone on my desk, not working with it, about 2 lines H signal.
when i switch to airplane mode....1-2% battery drain over a complete night!
its also no problem to activate airplane mode ON and afterwards WLAN additionally ON, then about 1-4% over a night!
i tried everything i found on the inet.
and i have my white L920 since Dec.12! (i did a "hard" update over PC in Feb. and also the the last release over the air...nothing changed)
so now i'm checking if this works for me and post results
I'm located in AUT with an unlocked, unbranded GER L920.
and we dont have LTE til now...maybee thats the problem..?!
dj_memory said:
Thanks for the tip!
I also have 5-8% per hour drain. (actual offi. release .1308...)
all off, sync, loaction, WLAN every thing, fresh reboot, phone on my desk, not working with it, about 2 lines H signal.
when i switch to airplane mode....1-2% battery drain over a complete night!
its also no problem to activate airplane mode ON and afterwards WLAN additionally ON, then about 1-4% over a night!
i tried everything i found on the inet.
and i have my white L920 since Dec.12! (i did a "hard" update over PC in Feb. and also the the last release over the air...nothing changed)
so now i'm checking if this works for me and post results
I'm located in AUT with an unlocked, unbranded GER L920.
and we dont have LTE til now...maybee thats the problem..?!
Click to expand...
Click to collapse
UPDATE:
i solved my battery drain issue by setting my "max network speed" to 2G!
by that i now have a drain of 1-2% p.h.!
dj_memory said:
UPDATE:
i solved my battery drain issue by setting my "max network speed" to 2G!
by that i now have a drain of 1-2% p.h.!
Click to expand...
Click to collapse
That is great. To bad that we whom have received the latest OTA no longer have access to that menu.
really?
I'm on FW 1232.5957.1308.0001
and WPH 8.0.10211.204
I don't need to change the network type within ##3282 menu, also worked for me in normal network settings.
dj_memory said:
really?
I'm on FW 1232.5957.1308.0001
and WPH 8.0.10211.204
I don't need to change the network type within ##3282 menu, also worked for me in normal network settings.
Click to expand...
Click to collapse
So then how do you set your network speed?
u don't need access to ##3282...its also possible to "limit" within settings/network. (##3282 NOT working within f.e. Rapdialer!!)
I limit it to "2G" only when its more importand to have less battery consumption than inet speed
limited to "2G" in my region it shows me afterwards a "E" on top.
On this PIC i found in the inet is "roaming" deactivated.
I have to activate "roaming" also when I'm within my own network to have inet access (and the "E").
In my town, network operators share their mobile radio transmitters.
I limited direktly at my provider the access to a "real roaming network" for example a swiss network.
Because i'm most of the time near the border
maybee not possible in your version or provider?
I'm on a free GER version.
Definitely trying this tonight.
For the battery drain try light (white) theme. intresting but that help my battery drain problem
Same issue here...Any updates?
Battery drain and over heat
moshepupkin said:
Same issue here...Any updates?
Click to expand...
Click to collapse
My experience is that, I reset the cellphone and after doing this twice and connecting to the internet and waiting for one hour, Microsoft gave me an update for my battery saver and since that time everything is ok, including the battery. I always believed that the updates have problems to be installed completely most of the time, so it's better to reset or download it via the computer and instal it with a cable( using Nokia Software Update). But if it doesn't work, please don't panic. The updates are coming and just be sure that you have reset your device without choosing the setting backup, for you must start afresh. Good Luck.
There has been quite a bit of discussion about Fast Dormancy, so I thought I would try to investigate it, and to explain things a little.
I don't claim to be an expert on this. Far from it. I'm merely putting across what I have found out about the subject, and what my observations have been on the it.
Firstly a little explanation on what FD actually is.
When your phone is connected via 3G data (not 2G or wifi) your phone needs to enter certain states in order to maintain this connection and allow data transfer. If your Operator does not have FD support or you have it disabled, then basically your states are just connected or not connected. What this means is that every time your phone connects to data, it will have to go through all of its various stages and internal functions in order to make the connection and then perform the actual data transfer. This is slow and obviously the more processing that is required, the slower your experience will be, and the greater the affect will be on your battery.
FD tries to tackle this problem by having several different states so that the full connection/disconnection cycle is not required every time. Each state has a different level of data throughput and power consumption.
DCH - High volume data (highest power consumption)
FACH - Lower volume
PCH - No data but keeps connection
IDLE_CCCH - Not entirely sure about this one but I think its an interim, lower level stage between PCH and:
IDLE - Connection dropped (lowest power consumption)
When in DCH state, your phone is doing the highest volume of data transfer, and obviously consuming most power out of your battery.
The way FD works is when transfer rates drop, the state drops to FACH for less power consumption and then back up immediately to DCH as and when required, or if this transfer state is over for the time being, (eg. you have stopped browsing) instead of going back to IDLE which would mean going through all the connection procedures next time data is required, the state drops down to PCH. This is a very low powered state, and when data is subsequently required, it can then immediately go back up to FACH or DCH with minimal effort. The less stages that is required to get the connection back up and running the better, both in terms of battery and speed.
To turn FD on/off enter *#9900# in the dialler to get into the SysDump screen then select the Fast Dormancy option
Alternatively, gokhanmoral has an app called FastDormancy Toggle for i9300 which can also do the job. I've not tried this app personally, but I've been told it works fine on the i9100.
Whether you keep FD on or not depends primarily on if your network operator supports it.
If your network operator supports it, then enabling it is not necessarily the best answer, as it can depend on the combination of the following things:
1. How you use your phone - Are you a heavy or light data user?
If you are a heavy data user then enabling FD is almost certainly the way to go. The less the phone needs to do in order to fire the connection back up, the better. However, if you rarely use the phone for a data connection, then it may prove beneficial to you to switch it off so that the IDLE state is entered sooner. Bear in mind before you decide on if you should turn it on or off, consider what your data sync options for contacts/calendar/email etc. are. If you dont browse too often, you may still be using data in the background quite often even though you are not physically doing so through various background syncs.
2. How "intelligent" your Operator's FD actually is.
I believe the operator defines the parameters for the timings of these different FD states, so results can vary drastically between different networks. To see how your carrier handles FD can be done via a simple test on a Samung ROM. With wifi off and FD enabled, at the dialler, type *#0011#. This takes you into the ServiceMode menu. The important piece of information here is the RRC State line. Press the home button and open a browser session and go into a web site, then immediately long press the home to get the list of tasks and select the ServiceMode app. The RRC State line should be DCH (or at least FACH) and you should see some activity in your signal indicator arrows on the status bar. Eventually you should see it drop down from DCH -> FACH -> PCH -> IDLE (sometimes you may see IDLE_CCCH). Ideally, the state should stay at PCH for a while, then eventually drop to idle.
My findings so far on JB is that FD seems to be handled differently to the way it was on ICS. In fact, I'm not entirely sure its working on JB at all! For me, it seems to go from DCH -> FACH, and shortly after that (perhaps up to 5 seconds) drops to IDLE. This is not great if your going to be using more data shortly, but ok if you are no longer browsing.
After further testing, it seems on JB it make no difference if FD is enabled or disabled in the ServiceMenu.
The transitional RCC states it enters seem identical regardless of the FD option you have set.
My testing when on ICS suggested that when going from DCH eventually down to IDLE, the handset seemed to go to FACH for a short period, then sit on PCH for sometimes up to 10 minutes. This has a big advantage if you are about to do more browsing shortly, is it will take much less power to resume the connection and enable the data transfer to begin more quickly, but has the drawback of if you have indeed ended your browsing for the time being, it would be using more power compared to if it was in IDLE. So swings and roundabouts.
Perhaps my observations on ICS (ie, remaining on PCH for up to 10 minutes) is how FD should behave.
Remember FD only applies to a data connection. It does not kick in whatsoever when you are connected to wifi or on 2G.
The quality of your data connection (ie. H+, H, 3G) may also have a bearing on how FD will perform. Better connectivity should give you a more efficient FD performance.
Tip 1.
If your wifi sleep policy is set to "keep wifi on during sleep only when plugged in" then this will mean your data will take a hit whenever your screen is off (unless plugged in of course) If you think FD is not for you because "I'm almost always connected to wifi" (ie. at home/work) then you will still need to consider what the best FD policy is for you when on this sleep policy, as obviously, your screen is off most of the day.
Tip 2.
If you are not connected to wifi overnight (either your not at within your router's range, or you have set your wifi sleep policy not to be connected) bear in mind what your phone does overnight in terms of background data activity (ie. your data sync options and widgets such as news/weather etc). If you have minimal data activity overnight (you set your widgets to sleep for example), then it would be better to switch FD off, as less battery would be consumed to go straight back to IDLE than hang around for possibly 10 minutes or more each time in FACH.
Note
You may well have a higher l2_hsic wakelock when FD is disabled, but when FD is enabled you may find this drops slightly, only to find another one called secril_fd-interface kick in instead, so again, swings and roundabouts.
I did extensive testing on this on ICS, and came to the conclusion that was better FOR ME to turn FD off, but the differences were not drastic. It can however make huge differences for others, depending on your Operator and your usage habits.
On JB, I've found it better to keep wifi on constantly, and keep FD enabled.
It would be interesting to compare how your firmware/carrier handles FD.
Bottom line is, try it and see what works best for you.
Note:
I don't think the *# service codes work on CM/AOKP based ROMs but you can certainly give them a try!
If the codes do not work on your Samsung ROM then you will need to install FactoryTest.apk.
Thanks for sharing! :thumbup:
I hear many members asking 'why' when asked to disable it..
"To err is human, to forgive is divine"
Sent from my SGS II
Great work I have been reading up on this lately. Nice to know that in JB it seems almost irrelevant... That's what all my unofficial tweaking/testing was indicating. I thought I must be doing something wrong.
Quick question though, do you know of any ways to turn off Fast Dormancy in 4.2.2 ROMs? I haven't found a way. Using gokhanmoral's app still results in a secril_fd_interface wakelock in BBS.
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