yashsingh1/xdaforums huggingface dataset:
[Galaxy Tab S2 Original Android Development] :
On this tablet battery drain in standby is awful also with LOS 15.1. It's been reported many times. I really hoped that 16 would fix this issue.
[Galaxy Tab S2 Original Android Development] tripLr:
Probably wore out the GPU
[Galaxy Tab S2 Original Android Development] lmacmil:
In 9 hours, the 2/17 build of 15.1 lost 8% with WiFi off and no apps open. The 1/10 build would only lose 2%. I don't know why one build would be so much worse than another. I won't go back to stock but it's disappointing. I guess at least some 15.1 builds are no better than 16.0.
[Galaxy Tab S2 Original Android Development] :
There are huge variations in idle battery usage also between different 15.1 builds and this has been going on for several months now. I asked myself why that should be the case many times. It's a real bummer: LOS is a fantastic ROM but battery usage is disappointing.

I read similar reports about the unofficial LOS 16 ROM for the OnePlus 6. If true, that might suggest an intrinsic issue of this ROM.
[Galaxy Tab S2 Original Android Development] lmacmil:
I flashed the 2/20 build of 15.1 yesterday. From 8 pm last night to 7 am this morning, it lost 0%. I'll stick with this one!
[Galaxy Tab S2 Original Android Development] gnarf49:
Thanks devs!

Just updated to official LOS16 by dirty flash + cache/dalvik wipe, no problems at all, everything working fine, LOS16 looks great :)

THANKS VERY MUCH DEVS!
[Galaxy Tab S2 Original Android Development] optionalmgrr.la:
Dirty flashed from 15.1 to 16. Pico gapps (arm64). Wipe cache. Hiorah!

Donation on the way
[Galaxy Tab S2 Original Android Development] Cozmo85:
Best tablet ever made
[Galaxy Tab S2 Original Android Development] optionalmgrr.la:
Audio level seems down low though. Or maybe my ears are failing
[Galaxy Tab S2 Original Android Development] kream21:
Just installed this and it is awesome! Trying to install Pixel launcher, but the app keeps crashing. Any ideas?
[Galaxy Tab S2 Original Android Development] :
Version 8.1.0 seems to be the latest that works. Later versions crash immediately upon start.
[Galaxy Tab S2 Original Android Development] matteo2:
Which bugs are there?

Inviato dal mio SM-G950F utilizzando Tapatalk
[Galaxy Tab S2 Original Android Development] nigeldr:
Went to perform 15.1 update this morning and was excited to see 16.0 official. Absolutely made my day and working brilliantly (also dirty flashed)
[Galaxy Tab S2 Original Android Development] optionalmgrr.la:
None as far as I see.

Audio level if can be higher will be great.

Battery life is good but maybe since t713 is a few years old not as good as new. Will try to replace it later.
[Galaxy Tab S2 Original Android Development] lmacmil:
To update from a recent 15.1 build, I just need to flash the 16.0 ROM and Gapps, wipe cache and Dalvik, and reboot? No need to wipe/format data, right? Thanks.
[Galaxy Tab S2 Original Android Development] :
Wipe system before you flash LOS and GApps.
[Galaxy Tab S2 Original Android Development] 511pf:
Thanks for this, lmacmil. It validates the issue I was having with LoS 15.1 (newer builds) and 16.0 as well. My experience is similar. I could never get idle usage below 0.6% to 0.7% per hour. On stock, I can get down to 0.2% per hour. My tablet sits 95% of the time, so idle usage is super important to me. Hopefully, the situation improves.

FWIW, there is a stock build for the UK dated 2/20/19 with the January 1, 2019 security update (which is really the thing I care about). Again, hoping that idle usage drops back down, as my preference is to run Lineage.
[Galaxy Tab S2 Original Android Development] lmacmil:
I am running the 2/20 build with the Feb 5, 2019 security patch and it loses 2% or less overnight. I see that 15.1 updates have stopped so I may take the 16.0 plunge soon, probably after the March security update is out.
[Galaxy Tab S2 Original Android Development] deejayjaytay:
16.0 Terrible Battery Life

The battery life was great on 15.1. It's awful on 16.0. I lost 25% battery capacity from a full charge in a few hours with very minimal use (a few minutes' worth). Something is wrong with this build.
[Galaxy Tab S2 Original Android Development] :
Well, I never found battery life on 15.1 great. At best it was ok and at worst awful. There were often large differences between builds (which I found quite hard to understand) and, even on the same build, sometime a reboot could change battery life dramatically in both ways: it could go from bad to good or viceversa. You never knew what to expect. This has been always the case and it was mentioned many times in the 15.1 forum. I am not sure if the developers can't pinpoint the problem or if it affects, for some reason, only a few devices and not others. Even a basic installation only with LOS and GApps (and no other application) showed the same behavior.

Unfortunately I see the same pattern with LOS 16. A few minutes ago I flashed the Mar 5 build and I noticed that with the previous one I lost 17% in 4 hours of standby! And in the past days I also saw that a restart would massively change battery usage. Exactly the same as with 15.1. :(
[Galaxy Tab S2 Original Android Development] hackintosh5:
Please, battery drain can be debugged in exactly the same way as any other bug. Send a logcat.
[Galaxy Tab S2 Original Android Development] deejayjaytay:
This is just a preliminary observation, but if you go to "Wi-Fi preferences" and disable "Turn on Wi-Fi automatically" and "Open network notification," the battery drainage appears to be much, much better.
[Galaxy Tab S2 Original Android Development] funkdoobi:
rom is amazing. when i first got this tablet, i didn't think it'd EVER get updates. I'm so glad there's still a community that loves the best small-factor android tablet out.
[Galaxy Tab S2 Original Android Development] Krystanos:
Same feedback as everyone else. The rom works great, there's even fewer bugs than in version 15.1. But battery is awful, a lot more awful than with version 15.1.

I guess this is very complicated to fix it, or even not possible, since this is the #1 bug in lineageos on this device, but since there's no feedback from maintainer, it's hard to tell...

Great work though, We can still handle the battery the way we did in 2010, by manually disabling network when not used... No option when it's used though... Just have a power supply next to you :)
[Galaxy Tab S2 Original Android Development] :
I tried this but I did not observe a significant difference. In my experience, when I notice an excessive battery usage, a restart might help at least temporarily. On the other hand it can also make things worse.

I am tempted to go back to 15.1. This ROM is otherwise excellent, battery drain is its only issue, but it's a huge one. Yesterday I lost 17% of battery (100% to 83%) in about 20 minutes of light browsing (no videos or animations, I was reading an on-line newspaper) with the display luminosity set at somewhere between 50% and 60%. The tablet was getting warm as if I were gaming.

This morning - I just checked - I see 2% idle drain and the CPU never goes into deep sleep.
[Galaxy Tab S2 Original Android Development] lmacmil:
If I flash 16 and decide I don't like it, can I go back to 15.1 by just wiping the system partition and flashing 15.1 ROM and Gapps? Or will I need to do a full factory reset?
[Galaxy Tab S2 Original Android Development] hackintosh5:
Please, GET A LOG!!!!

---------- Post added at 09:46 PM ---------- Previous post was at 09:45 PM ----------

Factory reset would be needed.
[Galaxy Tab S2 Original Android Development] busdonic:
I can't get USB file transfer to work with a desktop. I start to transfer a file, it looks like it's transferring, then just stops. Original file left on desktop. I'm using the original cable. Have toggled USB debugging back and forth, revoked prior USB debugging authorizations, changed USB default to File Transfer. Desktop is Win10 and I am using samsung drivers.

I'm on the March 3rd Build if it matters.

Any one have any suggestions or advice on why it isn't working? TIA!
[Galaxy Tab S2 Original Android Development] :
No need to shout! ;)

Here you go. Today I saw 2.1% idle battery drain over more than 7 hours. This is, in my experience with this ROM, more or less the minimum I can expect. Wakelock Detector does not show anything unusual, so I doubt that I have a runaway app that keeps the tablet awake.

Hope it helps!
[Galaxy Tab S2 Original Android Development] :
Now we are at a 2.6‰ per hour idle drain over 12.5 hours. See attached log. Still nothing unusual detected by Wakelock Detector. Basically in half a day with no use the battery went from 100% to 66%.

Incidentally, in my previous post I meant 2.1‰ *per hour*! It makes all the difference.
[Galaxy Tab S2 Original Android Development] deejayjaytay:
Thanks for submitting this! Hopefully it's an easy fix.
[Galaxy Tab S2 Original Android Development] optionalmgrr.la:
My tablet reboot when 15% battery using chrome, will test me see if its constant b problem
[Galaxy Tab S2 Original Android Development] lmacmil:
What kind of battery drain were you getting on 15.1?
[Galaxy Tab S2 Original Android Development] :
The idle battery drain depended inexplicably on the build. That said with a good build it was hovering at maybe 0.7 - 1%. Thus not really good, but still much better than what I experience with 16.

When in use the battery drsin depends clearly on what I am doing, so it's difficult to draw conclusions. However in a few cases I noticed a clearly excessive battery drain with LOS 16. I haven't installed new apps for ages (I use my tablet mainly to read ebooks, watch Netflix and browse news sites) thus I don't think that a badly written app might be the culprit.
[Galaxy Tab S2 Original Android Development] lmacmil:
I agree that the 15.1 builds varied significantly on battery drain. I have had a better experience than you with a "good" build. I am currently running the 2/20 build and it's very good. I turn off wifi and close all apps and lose only 1-2% in 8 or 9 hours overnight. AccuBattery reports .3%/hour over the last 70 hours, which is about a week because I usually turn it off at night. I'm tempted to try 16 but will hold off for now. I don't want to have to do a factory reset if I decide to go back to 15.1.
[Galaxy Tab S2 Original Android Development] :
I never turn off wifi. However also considering that, the drain of LOS 15.1 was still a bit high even with a good build. Based on my experience, if battery life is important to you, I would wait before upgrading. Otherwise LOS 16 is very smooth and stable, a very good ROM.
[Galaxy Tab S2 Original Android Development] lmacmil:
It would be interesting to see what the overnight drain would be on 16 with wifi off. I will leave wifi on tonight and see what happens.

I wonder how the age/condition of battery affects drain? My S2 is just over 2 years old and AccuBattery rates the health at 91%.
[Galaxy Tab S2 Original Android Development] 511pf:
For what it's worth, on LoS 15.1 (but not the 2/20 build) and 16.0, I was getting 0.6%-0.7% per hour idle drain, no matter what I did with wifi or anything else. On the stock UK build from 2/20/19, my battery drain is something like a 2-3 percent per 24 hours with wifi off. Same device, so battery age isn't an issue in my case.
[Galaxy Tab S2 Original Android Development] lmacmil:
Overnight with wifi on but all apps closed, battery drain was 7% in 9.5 hours ( from 67 to 60). That's about .7%/hour, quite a bit better than people are getting with 16. Still quite a bit higher than the drain with wifi off.
[Galaxy Tab S2 Original Android Development] sacto7:
Running pie. So used fing to check on my network/lan & see listed with an ipaddr, AirGo, as a device connected to my network! What is device "airgo" doing?

A search says that 'airgo' is an app, usually. Found that 'airgo' only applies to Oreo & Pie, so far.

Any problems if I disable or delete 'airgo'? & the USA govt claims that Huawei is a security risk when facebook is more so. then Qualcomm sneaks a device onto my network from my tablet. Interesting that both S2 & Nexus 7 have airgo with the same ipaddr. A google spyware?
[Galaxy Tab S2 Original Android Development] lmacmil:
For those who have flashed multiple 16.0 nightlies, have you found that battery drain varies widely from build to build as it does on 15.1?
[Galaxy Tab S2 Original Android Development] :
Before the March 12 build the idle drain was just awful. However the last two builds are quite good. The CPU finally goes into deep sleep and the idle drain is massively lower, at about 0.6 - 0.7% per hour. Let's hope that it stays like this!

A big thank you to the developers!:good:
[Galaxy Tab S2 Original Android Development] Deltadroid:
Strange. I don't see anything has changed since March 12.
[Galaxy Tab S2 Original Android Development] :
I can assure you that suddenly the idle battery drain dropped massively. On previous builds the CPU never went to sleep. Now it does for most of the screen-off time, which certainly explains the much lower battery drain. Other than flashing a new build, I didn't change anything.

I haven't looked at the changes between the builds but now I'm curious.
[Galaxy Tab S2 Original Android Development] deejayjaytay:
I didn't see anything obvious either, but yesterday's build was significant better (1% loss/hour) than before. There were some "POWER"-related commits, but I don't know what they did.
[Galaxy Tab S2 Original Android Development] 511pf:
This is exactly what I got with the early February 15.1 and 16.0 builds. It equates to about 14% drain every day. Stock drains maybe 5% per day, so we're talking 5-6 days of idle battery on Lineage vs 3 weeks on stock. I feel like there's a very long way to go.
[Galaxy Tab S2 Original Android Development] deejayjaytay:
Things are marginally better at best. I lost 16% over 12.75 hours today with WiFi turned off and *zero* access to the tablet. Logs were provided, but the developer who was berating us for lack of logcats hasn't responded since.
[Galaxy Tab S2 Original Android Development] hackintosh5:
Wait, since when am I a developer?

All I was saying is that if the developer can't reproduce the issue, they will need logs
[Galaxy Tab S2 Original Android Development] lmacmil:
I flashed the 3/13 build yesterday. I left it on last night, wifi off and no apps open. Battery drained from 66% to 63% in 12 hours. That's about the same as I got under 15.1. It may be worse than stock but I can live with that.
[Galaxy Tab S2 Original Android Development] Sector30:
Hi all,

I just wanted to chip in and say that I was running and early 16 build and was getting the same battery drain, dirty flashed to 20190314 nightly, now accubatttery is telling me I'm getting 0.4%/hr battery discharge for screen off time (for 16hrs of screen off/deep sleep). Awesome!

This is my first experience with lineage. I really like this little tablet, and being able to run Pie is, well, delicious!!

Thanks LuK1337!

Steve
[Galaxy Tab S2 Original Android Development] optionalmgrr.la:
Maybe it's placebo or something I saw a flat curve sleeping after updating to the latest build lasttnight
[Galaxy Tab S2 Original Android Development] lmacmil:
Last night I left wifi on. Battery drain was 11% in 12.5 hours and it was in deep sleep 88% of the time. With wifi off deep sleep is usually 98% or so. At any rate, that's less than 1% per hour so not too bad.
[Galaxy Tab S2 Original Android Development] deejayjaytay:
Ohh, I just assumed you were since you were insisting that others provide logs instead of providing them yourself.
[Galaxy Tab S2 Original Android Development] optionalmgrr.la:
there is a donate button i wish everyone of us can donate a little money as token and appreciation :D
[Galaxy Tab S2 Original Android Development] hackintosh5:
Technically I do develop, I could read the logs but I'm very busy (making VoLTE work for my device singlehandedly, just ironing out some bugs)
[Galaxy Tab S2 Original Android Development] NoClaim:
I have installed LineageOS 16 official now 1 week ago. This is the first custom rom on the S2 tab I use and have no experience with this tab2 at all.

Everything seems to run smooth, except for one thing: I can't connect my headset using bluetooth. The device is just not seeing it when I put the head set in discover mode and searching on the tablet.

Yes, I'd used the head set before using stock rom, other devices are visible (tried an BT headset from JBL) but my SkullCandy headset is just not showing when searching for devices.

Anyone an idea what to do?
[Galaxy Tab S2 Original Android Development] Sector30:
First thing I would try is pairing the SkullCandy headset with another device, to confirm the headset is going into pairing mode like you expect.

From what you describe, doesn't sound like the tab S2 is the problem, as the JBL is visible.

I have a Jabra headset paired with my tab s2, pairing worked as expected.

Steve
[Galaxy Tab S2 Original Android Development] NoClaim:
The SkullCandy is working fine with other devices. It also worked with the S2 when still on stock. Now the only thing changed is the stock --> LineageOS 16. So my 'asumption' it is with the ROM is not that strange I guess.
[Galaxy Tab S2 Original Android Development] hackintosh5:
You should capture a HCI Snoop Log if you can't fix it by trial and error. Enable the option in developer options, reboot and enter pairing mode. Then grab /data/misc/bluetooth/logs. Note your MAC Addr and maybe other pii info is in this log.
[Galaxy Tab S2 Original Android Development] lmacmil:
1st 16.0 hiccup last night. I couldn't turn wifi on so I went to settings, which came up as a blank screen. Could not get the settings menu to appear no matter what I did so I pushed the power button and selected restart. The screen sat there saying restarting for a couple minutes. I could not turn it off by holding down the power button. Had to hold power, vol down and home to get it to shut off. This has never happened before. A one-time glitch? An impending hardware issue? A 16.0 issue? Who knows?
[Galaxy Tab S2 Original Android Development] deejayjaytay:
Ohh lawdy, the 03/18 build is beautiful. Watched videos on it for ~40 minutes and it only drained about 15%. Charged back up quicker than normal as well. If you're having battery-drain issues, try using this build.
[Galaxy Tab S2 Original Android Development] optionalmgrr.la:
Yes [MENTION=5075128]LuK1337[/MENTION] what did you cast magic on these new builds. :D
[Galaxy Tab S2 Original Android Development] LuK1337:
nothing.
[Galaxy Tab S2 Original Android Development] brightjh01:
Just updated from 15.

Great so far. thanks for the work.
[Galaxy Tab S2 Original Android Development] vaggelix:
Hello I seem to have trouble with Bluetooth too. I have a JBL Charge 3 that I'm unable to pair. It doesn't even detect it at all. Bluetooth works fine since I can see my mi band 3 on the device list but the charge 3 just won't show up. It worked fine with lineage os 15.1, it only has problems with 16.

What can I do to help with this?

Great work BTW everything else seems to be working even better than before.
[Galaxy Tab S2 Original Android Development] takkischitt:
Having trouble with Google Maps. When I open the app, I get the UI but no map. Have tried reinstalling Maps, restarting, but no luck.

Anyone else have this issue or have any suggestions on how to fix?

EDIT: Oddly, it seems to be working fine today. Will keep an eye on it.
[Galaxy Tab S2 Original Android Development] lmacmil:
I have not had any issues with maps.
[Galaxy Tab S2 Original Android Development] :
No problems with Google Maps here...
[Galaxy Tab S2 Original Android Development] hackintosh5:
Deleted
[Galaxy Tab S2 Original Android Development] takkischitt:
Thought I'd follow up for anyone considering running this ROM after having been using it for a few days now. It's very good. And the battery life is a LOT better than the factory ROM, although I am also running an Automate flow chart which turns the WiFi off when the screen has been off for 30 seconds, then enables it again when the screen turns on. I only need it to connect when I'm actually using it.

Great stuff, all in all! Thanks!
[Galaxy Tab S2 Original Android Development] 511pf:
What's your idle battery life like? Everything I've seen indicates that it's ~double or more stock.
[Galaxy Tab S2 Original Android Development] takkischitt:
Do you mean overnight or something, when it's not being used? If so, then it maybe drops a couple of %.

Let me know exactly what way you want me to check and I'll do it and come back to you.
[Galaxy Tab S2 Original Android Development] samsingla:
I ran into issues installing twrp recovery. Tried reflashing it, but whenever I boot into recovery, it keeps saying could not do normal boot and then enters download mode. Can some please suggest a way to fix it?
[Galaxy Tab S2 Original Android Development] wakkaday:
which version of gapps do i need? i managed to flash but the version of gapps i dl, keeps crashing

MindTheGapps-9.0.0-x86-20190216_211139
[Galaxy Tab S2 Original Android Development] :
I use OpenGApps (ARM64, Android 9.0, Stock).
[Galaxy Tab S2 Original Android Development] lmacmil:
I flashed that version and it worked fine.

Correction, I flashed the Arm64 version.
[Galaxy Tab S2 Original Android Development] 511pf:
Thanks! Accubattery records this number once you install and start it. Previously, the lowest I've seen is around 0.6% per hour. Stock is more like 0.2% per hour, which means its idle battery is measured in weeks and not days. Thanks again!
[Galaxy Tab S2 Original Android Development] takkischitt:
Is this with apps installed? I have quite a few apps installed so not sure I could give that accurate a baseline, to be honest. I've installed Accubattery to see what sort of info I can get you anyway. Looks like a good battery stat app.
[Galaxy Tab S2 Original Android Development] :
I just noticed that... You have to download the

arm64

version!
[Galaxy Tab S2 Original Android Development] lmacmil:
I have been on 2 builds, the 2/20 and now the 3/18. AccuBattery is showing .4%/hour for screen off drain for 95 hours. Pretty sure I reset the stats after I installed the 3/18 build. I almost always turn off wifi when I'm not using it.

Last night battery drain over 12 hours was only 1% which is as good as I've seen on any 15.1 or 16.0 build.
[Galaxy Tab S2 Original Android Development] 511pf:
Accubattery will report the idle battery number for you. There isn't really anything else to do on your end. That idle battery number is definitely with apps installed, Wifi disabled and sync disabled wherever possible.
[Galaxy Tab S2 Original Android Development] brightjh01:
Well it's been a week and it works great for me . I use my T713 for a media player, casting to chromecast or bluetooth. Only it i see it take a long time to reboot .
[Galaxy Tab S2 Original Android Development] paris123:
This is a rock solid release. Battery life is much better than lineageos 15.1. Greatly recommend this to everyone with a T713 tab s2.
[Galaxy Tab S2 Original Android Development] alias4ever:
Thanks for the recommend! How does battery life compare to stock ROM? Just curious. :) Thanks again! :D
[Galaxy Tab S2 Original Android Development] De1v3c1o:
More people with problems to have root acces?

I've tried everything, but it doesn't work!

I also install the SU binary and have the option in my developer mode, I've tried CF Autoroot and Magisk and that doesn

t work either.
[Galaxy Tab S2 Original Android Development] :
Would this work on the 719 if I don't care about or don't want the LTE capabilities?
[Galaxy Tab S2 Original Android Development] takkischitt:
So AccuBattery for me is showing 2.8%/h discharging speed with screen off, but I have left WiFi on recently and as I said, I've quite a few apps which sync in the background etc. Think there's maybe a couple of apps which are draining more than they should, also. So I'll look in to that.

---------- Post added at 05:07 PM ---------- Previous post was at 05:05 PM ----------

Has anyone encrypted their S2 with this ROM? Does everything work OK after encrypting, e.g. updates?