Question WifFi Scanning - Samsung Galaxy S21 Ultra

Comrades, do you suggest having this option turned on? I think this option should be enabled if the phone has to connect automatically to network under wifi option...Does leaving wifi scanning on drain battery? Or has this improved a lot from Android 6.0 (which created havoc on the battery when this was turned on) such that the impact on the battery is very negligible? comments pls...

It will still have an impact on your battery; nowhere near what it was back then. There is an option in the Developer Options to limit how often it does the wifi scanning to help offset.

mprunty said:
It will still have an impact on your battery; nowhere near what it was back then. There is an option in the Developer Options to limit how often it does the wifi scanning to help offset.
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thanks...will check it out..

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[Q] WiFi Battery Drain

Alright I hate to ask this question, but my searching and reading is not leading anywhere. I recently upgraded to GB (Illuminance with Corn) and I'm loving how fast my phone is. The only problem I notice is how fast my battery drains while on WiFi (Wireless N with WPA2).
Example: I was at my parents house for 2.5 hours, but didn't bother turning wifi on. I only lost a few %. Once I got home, I kicked on the wifi and within an hour I lost 20%. It appears that when wifi is turned on it is almost constantly in use. I checked for rogue apps and data usage and found nothing. The only thing I notice is that every 5 seconds (yes, I actually timed it) it is polling for new networks.
After doing some reading I checked and the build.prop mods are in there (wifi.supplicant_scan_interval).
Any suggestions on where to go next?
Recap of phone config:
Rom: Illuminance 3.01
Kernel: Corn 7.06
Modem: KK4
Yeah...I've noticed that the build.prop tweaks for wifi scanning don't actually seem to change the scanning interval on gingerbread ;/
Try going to, Settings> wireless and networks> wifi settings> menu button> advanced> set wifi sleep policy to "when the screen turns off"
That'll help while it's asleep.
studacris said:
Settings> wireless and networks> wifi settings> menu button> advanced> set wifi sleep policy to "when the screen turns off"
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+1
I switched my ROM from Apex to Illuminance to test a theory that this functionality would work as it had in the past on Apex ROMS. For whatever reason kernels/framework were swapped in a newer version of Apex that killed this very helpful functionality. Once I switched to Illuminance and enabled the functionality, it works again and I get 2+ days worth of battery life with moderate usage (rarely a video/music played, but I do a lot of browsing and email usage/fb/twitter usage is high).
It drove me nuts on Apex trying to figure out the issue. I had thought my settings.db files that control the wifi functions had gone corrupt and the dev ignored any requests for assistance.
Glad I made the switch.
studacris said:
Yeah...I've noticed that the build.prop tweaks for wifi scanning don't actually seem to change the scanning interval on gingerbread ;/
Try going to, Settings> wireless and networks> wifi settings> menu button> advanced> set wifi sleep policy to "when the screen turns off"
That'll help while it's asleep.
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That was the first thing I noticed. The ROM defaulted to Always On. I changed that the first day. Unfortunately, I still have the issue. As it stands, I only get one day at most out of my charge. The only thing I let sync is the gmail account. I mostly browse and talk less than 1 hour per day.
I'll try to do a more statistical approach when I get a chance. I'll see about taking readings ever half hour with the wifi on and no other use.
I was under the impression that if the phone downloads data over WiFi it actually uses less battery than if it downloaded data over 3G. When I'm at home, I leave my WiFi on intentionally when my phone is asleep so that my incoming email is more efficient since I have WiFi available.
Am I wrong here? Just curious if I've been mislead all this time.
I don't think you're wrong. That is why I always use wifi at home. I think I found some errant scripts that were running and causing the excess battery drain. I have taken those off.
I'll probably master clear and reload when I'm no longer on call this weekend just to make sure I got everything.

[Q] Wifi never goes off in sleep mode

I have a strange problem. I set the 'Keep Wi-Fi on during sleep" to "Only when plugged in" but I see that Wi-Fi stays always on, also during sleep. In addition I noticed that the largest battery consumer is Android OS. Any ideas what's wrong?
amarguli said:
I have a strange problem. I set the 'Keep Wi-Fi on during sleep" to "Only when plugged in" but I see that Wi-Fi stays always on, also during sleep. In addition I noticed that the largest battery consumer is Android OS. Any ideas what's wrong?
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Under Wifi Advanced Settings, you probably have the option for "Scanning always available" enabled. This keeps wifi available for location services, and makes it look like it's always on to the power monitor.
No. It is disabled
amarguli said:
No. It is disabled
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Your battery usage doesn't look off. Android OS is almost always the biggest battery consumer on mine unless I'm using the phone heavily. wifi is typically 3-4.
I easily get through a day on a single charge. Usually I've got between 20-40% left at night depending on usage.
As for wifi I don't know. Perhaps there is another app keeping it on. I would try turning all location services off and see if that changes anything.
I'm curious why you'd want wifi off. generally it will default to the mobile signal which will use a lot more power. only reason to turn wifi off is if you don't have access to it.

WiFi remains active even after I disabled (battery)

Guys, tonight I decided to switch off mobile data and WiFi when I went to sleep. Now noon, when the battery was almost over I decided to analyze some attention to battery depletion statistics and realized that even turning off the WiFi it continued to appear that spent the whole night on. Also, see that shortly after I slept network operator turned yellow. How to explain? My carrier has the much more stable network overnight just by reduced use and the absence of network overload.
He had the 3g network enabled, less mobile data.
It happens to me too. I guess it's only a visual issue, I dont think wifi is draining battery life.
Due to Wi-Fi scanning always available. Its actually keeping the Wi-Fi on if that option is chosen in Wi-Fi advanced options. Turn that off and you'll see that your Wi-Fi actually shuts off.

Tremendous battery drain on WIFI

Hey guys, I am running stock 4.0.3 rooted with supersu and using the latest franco kernel. I am getting massive drains even while using the phone on wifi and keeping it on standby, while connected to wifi. Getting drains about 3.3-4% per hour on standby on wifi. This is absolutely crazy. I tried some older suggestions mentioned here https://forum.xda-developers.com/showpost.php?p=62074306&postcount=118 . But even that doesn't work. Battery drain is normal on mobile data, but when connected to wifi it absolutely goes crazy. Can anyone provide any insight? There are no rogue apps, I have been checking through better battery , wld , accu battery, etc.
You've probably already turned it off, but I'll just point it out in the rare instance, but make sure scanning is off. However, I did notice that you said it is when wifi is on and your phone is sleeping when you get that drain. A fix is to go into wifi settings and under "Keep Wi-fi on during sleep", pick the only plugged in option. Ideally, you should get to the bottom of this issue, but if you don't have the time and no one else figures it out, this may help.
EDIT: I wonder if smart wifi switcher has anything to do with it? Wifi connectivity fluctuates and if you have two connections that have very similar signal strength, would your phone constantly switch between the two networks in a futile manner? If this does happen, I can see that draining your battery significantly, but this is based on the premise that the switcher does not have some type of buffer zone where it does not switch if the difference is negligible.
Inflection said:
You've probably already turned it off, but I'll just point it out in the rare instance, but make sure scanning is off. However, I did notice that you said it is when wifi is on and your phone is sleeping when you get that drain. A fix is to go into wifi settings and under "Keep Wi-fi on during sleep", pick the only plugged in option. Ideally, you should get to the bottom of this issue, but if you don't have the time and no one else figures it out, this may help.
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Yep, I always keep scanning off! And i did try with that suggestion too, I changed the setting to never and it still drained battery. Wifi stayed on for sometime even though i set it to never and then finally turns off after a period of time, but i think that could potentially drain more battery? Are you using wifi all the time? What are your stats?
I have all those settings turned off, smart switcher, ipv6, scanning, etc
Anomaly65 said:
Yep, I always keep scanning off! And i did try with that suggestion too, I changed the setting to never and it still drained battery. Wifi stayed on for sometime even though i set it to never and then finally turns off after a period of time, but i think that could potentially drain more battery? Are you using wifi all the time? What are your stats?
I have all those settings turned off, smart switcher, ipv6, scanning, etc
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Last thing I can think of is trying to use stock kernel to see if it is FK that is the culprit. FK shouldn't be the issue, but perhaps something screwed up during the flashing process? Now I'm essentially just asking you to do trial and error
Inflection said:
Last thing I can think of is trying to use stock kernel to see if it is FK that is the culprit. FK shouldn't be the issue, but perhaps something screwed up during the flashing process? Now I'm essentially just asking you to do trial and error
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Nah man, I trust FK more than stock
I have had similar issues with stock as well.
What are your battery statistics?
Anomaly65 said:
Nah man, I trust FK more than stock
I have had similar issues with stock as well.
What are your battery statistics?
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Note that I'm in Beta 3 and running its stock kernel so I don't really see the usefulness of giving my battery stats, but yes, battery life for me has been good and unaffected by wifi draining.
Inflection said:
Note that I'm in Beta 3 and running its stock kernel so I don't really see the usefulness of giving my battery stats, but yes, battery life for me has been good and unaffected by wifi draining.
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Whoa, how the hell do you even get 2 hours 17 mins sot with 85% still remaining?
Is it really just me suffering from this wifi drain bug?
Anomaly65 said:
Whoa, how the hell do you even get 2 hours 17 mins sot with 85% still remaining?
Is it really just me suffering from this wifi drain bug?
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It's most likely not just you, but based on my perusal of the 3T forums (especially on the FK thread because that's most relevant to how you set up your phone), not many people are facing this issue. Does betterbattery stats not show anything funky or out of the ordinary? Can you post a screenshot of your betterybattery stats including the kernel wakelocks, alarms, and partial wakelocks page?
Inflection said:
It's most likely not just you, but based on my perusal of the 3T forums (especially on the FK thread because that's most relevant to how you set up your phone), not many people are facing this issue. Does betterbattery stats not show anything funky or out of the ordinary? Can you post a screenshot of your betterybattery stats including the kernel wakelocks, alarms, and partial wakelocks page?
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Check these out. I am totally fed up. I think I might have a faulty unit.
Getting 4% drain on standby!
Anomaly65 said:
Check these out. I am totally fed up. I think I might have a faulty unit.
Getting 4% drain on standby!
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I'm beginning to think it's not wifi, but the app Saavn. It may act differently when on wifi vs on cellular data and remain active constantly when on wifi. I google searched the app and its potential of being poorly optimized app, and there are reports of it never turning off and running in the background. If that is the case, it should be showing up on BBS as more of a drain, but for some reason it isn't. Still, try uninstalling the app and see what happens.
In the end, if this doesn't solve the issue, I'm beginning to think a factory reset maybe in order. I wish you also gave me BBS alarm wakeups page because that would help see if Saavn is constantly firing off alarms or not.
Go to your "Location settings" and into the 3 dot menu in upper right. Turn everything off.
do you have wifi calling on? turn it off and see
smajlo said:
Go to your "Location settings" and into the 3 dot menu in upper right. Turn everything off.
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I have them turned off since day 1
masri1987 said:
do you have wifi calling on? turn it off and see
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Where exactly is the setting to turn it off?
Anomaly65 said:
I have them turned off since day 1
Where exactly is the setting to turn it off?
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settings > sim and network > look towards the bottom
masri1987 said:
settings > sim and network > look towards the bottom
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I don't have any option to turn off wifi calling in there. I am running the beta 7.1.1 now though. But the problem still persists. Too much drain when using wifi, it's being shown as android system drain. I've seen many people reporting it, so it's not just me. But for the life of me, I can't figure out what's causing it!
Issue resolved with latest 4.1.0 and some usage pattern changes. Mod, please close the thread. Thank you!

S10e wifi battery drain?

I got my S10e exynos a little over a week ago and gave it some good weekday battery life testing throughout the this past work week.
The screenshot is after a day of work, with the vast majority of the time on LTE and noticing massive WiFi drain. I've noticed that WiFi drains between 25-45% no matter if I'm using WiFi the majority of the time or not. Compared to my Pixel 3 that drains 5-10% from WiFi.
Anyone else getting WiFi drain? Could someone with a S10e SD855 post some battery stats? Please use gsam if possible.
Is your WiFi scanning turned on?
big_b0sss said:
Is your WiFi scanning turned on?
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Hard to determine which of these options would be considered "WiFi scanning", but they're all off except LTE switch over.
Just search wifi scanning and Bluetooth scanning
Biometrics and security, location, improve accuracy, turn off wifi / bluetooth scanning.
connections, wifi, advanced, I disabled the "switch to mobile data" to get better battery
Yes I am having this issue as well on my S10+ US Unlocked version. 1.5 hours of screen on time draining 5%, WIFI draining 8%. Doesn't make any sense. All o fmy WIFI scanning and auto switching is turned off.
Someone said it is because the phone doesn't go back to sleep on Exynos models after you've received a phone call
A reboot fixes it until your next phone call
Patch should fix it
Reboot doesn't fix it for me. I also have had two different s10s so it is definitely something software related. It drains so Mich that I keep wifi off unless I absolutely need it.

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