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[Q] Which Kernel should I use to reduce battery drain? [CM 10.1]

Hey everyone!
I flashed CM 10.1 yesterday (cm_p500-userdebug-cm-10.1 from jenkins. androidarmv6.org/job/android/ and I'm amazed how smooth and perfect it is working (A huge 'Thank you!!' to the developer )
The problem is that my battery drain is awful. It took less than 8 hours today to completely discharge, though I hardly touched it.
I used Battery Calibration and also installed "WakeLock Detektor" to see where the problem is, and it stated that my phone isn't asleep 99% of the time though the display is turned off most of the time :crying:
The main reason is a kernel-related thing named "suspend_backoff" that keeps it awake.
I wanted to install a different kernel, but I got no clue which one... I actually planned on installing the recent DorimanX-Kernel, but then recognized that this is only available for the Galaxy SII
Can anyone recommend a Kernel that keeps my system running smooth but the battery drain at a minimum? I basically need my phone for Messaging (SMS, WhatsApp, E-Mail), Calendar and once in a while as navigation system. So no need for spectacular game performances or so.
Are there other Ways to improve my battery life on that phone (I've read all the general tips for improving battery life)? Maybe some OC things I can change manually?
I'm grateful for any help. Thanks!

Helbelinc said:
Hey everyone!
I flashed CM 10.1 yesterday (cm_p500-userdebug-cm-10.1 from jenkins. androidarmv6.org/job/android/ and I'm amazed how smooth and perfect it is working (A huge 'Thank you!!' to the developer )
The problem is that my battery drain is awful. It took less than 8 hours today to completely discharge, though I hardly touched it.
I used Battery Calibration and also installed "WakeLock Detektor" to see where the problem is, and it stated that my phone isn't asleep 99% of the time though the display is turned off most of the time :crying:
The main reason is a kernel-related thing named "suspend_backoff" that keeps it awake.
I wanted to install a different kernel, but I got no clue which one... I actually planned on installing the recent DorimanX-Kernel, but then recognized that this is only available for the Galaxy SII
Can anyone recommend a Kernel that keeps my system running smooth but the battery drain at a minimum? I basically need my phone for Messaging (SMS, WhatsApp, E-Mail), Calendar and once in a while as navigation system. So no need for spectacular game performances or so.
Are there other Ways to improve my battery life on that phone (I've read all the general tips for improving battery life)? Maybe some OC things I can change manually?
I'm grateful for any help. Thanks!
Click to expand...
Click to collapse
I found SweetnSour's version 11 kernel quite good with cm10.1.
However, the ROM needs some help to get good battery life:
Install 2xBatterysaver. It will turn off data and WIFI when the screen is off (turn them on periodically to allow syncing). There are various apps like this one.
Control WIFI. Use Y5 battery saver or Whiz WIFI manager. Y5 is tiny and effective but crashes on cm10.2. Both check for favorite hotspots, leave WIFI on and turn it off when leaving the hotspot.

Thanks for your quick response!
Just tried to flash Sweetnsour's Kernel, but it won't work. I flashed this one --> versionFINAL-CFS.zip
Is that the correct one or rather one of those? -->" version11-CFS-TWRP.zip" or "version11-CFS.zip"
Edit: What actually are CFS respectively TWRP? Searched the forums but couldn't find an answer

[solved] or rather [solvished]
After days of trial and error, cutting and re-enabling all connections from WiFi to 3G and hibernating, un- and re-installing basically all of my apps and trying loads of other roms I didn't love as much as this in the least, I found the source for my phone being awake basically 100% of the time.
The changelog of the mod stated that there's still this WiFi-issue that keeps the phone awake.
Well, though I've tried before, It now works: switching off the WiFi connection finally gets my phone to sleep.
I think I'll just be running on my mobile data for the followin days or weeks until this bug has been fixed.
Btw: A little hint for the developer (I'm posting here, since I'm a noob and can't post in the developers forum): When switching the WiFi options to turn out WiFi whenever screen goes dark, it won't connect afterwards. I always needed to reboot my phone when I wanted WiFi to work again. (This bug also caused my mobile data not to work. It apparently thought WiFi was running, though it couldn't connect.)

[Q] No deep sleep but no wakelocks huh?

Hello all, I recently noticed that my OPO was not going into deep sleep. So I installed wakelock detector and to my surprise, nothing out of the ordinary was going on. I proceeded to wipe the dalvik and cache, still nothing, won't deep sleep. Last night I flashed franco kernel in the hopes that it would solve the problem, guess what, nothing, still won't deep sleep. The phone just drops to 300mhz and stays there for the minimum frequency.
I'm running liquid smooth 3.2 (4.4.4) with the recently flashed franco kernel.
Do you guys have any other suggestions on what to do?, I was just about to flash an entirely new rom and keep it barebones till the end of the week when cm 12s and oxygen os are released.

I'm experiencing exactly the same issue..

amd-dude said:
Hello all, I recently noticed that my OPO was not going into deep sleep. So I installed wakelock detector and to my surprise, nothing out of the ordinary was going on. I proceeded to wipe the dalvik and cache, still nothing, won't deep sleep. Last night I flashed franco kernel in the hopes that it would solve the problem, guess what, nothing, still won't deep sleep. The phone just drops to 300mhz and stays there for the minimum frequency.
I'm running liquid smooth 3.2 (4.4.4) with the recently flashed franco kernel.
Do you guys have any other suggestions on what to do?, I was just about to flash an entirely new rom and keep it barebones till the end of the week when cm 12s and oxygen os are released.
Click to expand...
Click to collapse
Maybe the PlayServices are the Problem somewhere here is a guid to prevent them to keep your phone awake

Actually play services did not come up in the battery stats to indicate it was indeed active. I ran through anything, there is nothing causing unnecessary wakelocks. So that's why I'm confused.

amd-dude said:
Actually play services did not come up in the battery stats to indicate it was indeed active. I ran through anything, there is nothing causing unnecessary wakelocks. So that's why I'm confused.
Click to expand...
Click to collapse
Play Services doesn't always show up as Play Services in the battery stats page in your settings menu, it quite often will show up as Android OS.
Transmitted via Bacon

timmaaa said:
Play Services doesn't always show up as Play Services in the battery stats page in your settings menu, it quite often will show up as Android OS.
Transmitted via Bacon
Click to expand...
Click to collapse
Not even that, as I said there was nothing android related nor was there any app in wakelock detector that was showing signs of a wakelock. For good measure I did follow the many guides on stopping google services etc. and none of them worked. Phone still won't go into deep sleep. Strangely enough it was wasn't affecting my battery life that much, was still getting about 6hrs on screen time with 14% battery left.

amd-dude said:
Not even that, as I said there was nothing android related nor was there any app in wakelock detector that was showing signs of a wakelock. For good measure I did follow the many guides on stopping google services etc. and none of them worked. Phone still won't go into deep sleep. Strangely enough it was wasn't affecting my battery life that much, was still getting about 6hrs on screen time with 14% battery left.
Click to expand...
Click to collapse
Sounds to me like your battery stats might just be screwy.
Transmitted via Bacon

So now I'm wondering, as well. What would an example of good/excellent deep sleep look like? % drop over time?
My battery stats show cell standby at 1%, phone idle at 1%, and over over eight hours go from 100% to about 86%. Would that drain be considered deep sleep, or good deep sleep?

I had a similar issue and able troubleshoot successfully.
Device:
- POCO F1
- MIUI 12.0.3.0, Android 10
- Magisk 21
What tried but didn't help
- There is no wake-locks active
- Tried Battery Saver and Ultra Battery Saver
- Tried Airplane mode
- Tried rebooting
- There is no significant battery drain (only 1.6% per hour)
- Tried disabling Proximity sensor
- Tried wiping dalvik-cache
I have followed the guide by Intel at https://software.intel.com/content/...-no-sleep-issues-in-android-applications.html
As I mentioned earlier, there is no active wakelock, that is why the troubleshooting was much difficult.
I have digged into `/sys/kernel/debug/wakeup_sources` and sorted processes based on the column `prevent_suspend_time`. The process `qtidataservice` was on the top. Not sure what it is, but it's probably from Qualcomm and running under the `radio` user.
The `strace` was showing nothing. I have simply killed that process. It's eventually re-created with a new PID. Interestingly the device began to go Deep-sleep while in idle.

Any 5.1 ROM that doesn't have these Android System/OS/Kernel battery issues?

Before I begin I just want to say that I have been using Android for a while and understand wakelocks etc. I have already made sure none of my apps are causing wake locks by uninstalling them but it has made no difference.
Here are my GSam screenshots: http://imgur.com/a/1Cp9z#0
As you can see, Android System and Android OS are the culprits that are draining my battery, but the phone isn't "awake" when they are draining it, so I am not quite sure what is happening. There is no wake-lock but there is a lot of CPU usage for some reason,
Please ignore the average times shown by GSam at the bottom, I get nowhere near 5hrs screen time, I reset the histories yesterday so its not yet calculated average properly yet.
I have tried - Stock COS11S, the latest COS 12.1 and also CyanogenMod 12.1 nightlies and the recent snapshot and they all exhibit this issue even with no apps installed. Is there a ROM out there that has no issues with this stuff?
Thanks!

Same problem. No idea the solution. No matter what battery app I use to try and tell me what is going on, it's always just listed as "android system" or "system" that is draining battery. I didn't have this on sultan's build so I guess it's back to that.

I dont want to give yo spoilers...
you can try every rom here, every kernel, every mod...
it really up to your personal use... you do this 3 simple things and like me will reach 5, 6 hours SOT.
disable lte and go for EDGE
restrict privacy guards things on apps: keep awake, auto start, wake up... on every app you install
use your social network on browsers... installed apps use background...

LineageOS is here!!! [ROM MM]

LineageOS is here!!!
The title is enough, I think,
I haven't tested it yet but.... the first LineageOS ROM for our beloved Photon appeared !
https://download.lineageos.org/xt897

I've been 2 days using this rom on my xt926 so far is good and fast

Thanks, do we have to 'clean-install' this?

clean install was safe.
You'll get a broken notification status bar eventually and you'll need this:
https://forum.xda-developers.com/showpost.php?p=67444950&postcount=721
I spent half-a-day

palmwangja said:
clean install was safe.
You'll get a broken notification status bar eventually and you'll need this:
https://forum.xda-developers.com/showpost.php?p=67444950&postcount=721
I spent half-a-day
Click to expand...
Click to collapse
gapps package which removes CyanogenSetupWizard/LineageSetupWizard is broken and shouldn't be used.
There's no such issue with opengapps nano package which I use.

you can avoid wiping if you "hack" a bit.
I had only to defeat the check (adding the key to htmlviewer in the package.xml (or something like that)) and do a "pm grant com.android.systemui android.permission.READ_CONTACTS" via adb (to enable the logon screen).
Additionally, I did something like
for i in /data/app/*; do
pm install -r $i/base.apk
done
(could have small errors, is two weaks sine then ) to fix the other permissions problem (most with network status access)
It works apparently

Upgrade done almost flawlessly from LL resurrection remix to Lineage OS 13
Few apps had permission problems, i fixed it just restoring the app (app only, no data) using titanium backup.
Anyway I went back to RR given I like it more, and I can't see any real improvement on MM over LL

I am experiencing huge battery drain. Battery in idle last for about 8 hours. Even when phone was in airplane mode during night it fall from 100% to 75% during about 8 hours. Previously with Cyanogen I've lost maybe 3% during the night tops.
Battery stats does not shows any apps that goes wild. I've installed GSam Battery Monitor and it shows that battery is used mainly by kernel (~40%) and LineageOS (20-30%), but it was running only about half an hour. I will check tomorrow morning after airplain mode night, maybe something came out.

sc0ty said:
I am experiencing huge battery drain. Battery in idle last for about 8 hours. Even when phone was in airplane mode during night it fall from 100% to 75% during about 8 hours. Previously with Cyanogen I've lost maybe 3% during the night tops.
Battery stats does not shows any apps that goes wild. I've installed GSam Battery Monitor and it shows that battery is used mainly by kernel (~40%) and LineageOS (20-30%), but it was running only about half an hour. I will check tomorrow morning after airplain mode night, maybe something came out.
Click to expand...
Click to collapse
Have you checked if the CPU is entering deep sleep? My phone usually manages > 80% time in deep sleep. Of course that would depend on usage. Previous ROMs (nearly all) virtually never entered deep sleep. This one wallows in it.
If I leave it over night (clearing stats at the beginning) it gets very close to 100% I personally use CPU Spy, but there are many apps that would show you if you dont already have one.

I've installed CPU Spy, will see the stats after the night. I've also installed Greenify and I think battery consumption is better now, so I suspect one of my apps was preventing my phone from going to deep sleep.

According to CPU Spy my phone never goes to deep sleep when in airplane mode. I've checked this also with clean rom installed, without gapps or any other apps, just CPU Spy. I'm gonna open ticket in LineageOS JIRA.

sc0ty said:
According to CPU Spy my phone never goes to deep sleep when in airplane mode.
Click to expand...
Click to collapse
so, when its not in airplane mode, it does go to sleep?
I just tested mine, and even with a ton of apps, Xposed, Viper, Magisk etc etc it still went to sleep quickly. This ROM for me wallows in deep sleep. Previous ROMs hardly visited deep sleep if at all.

DiamondJohn said:
so, when its not in airplane mode, it does go to sleep?
Click to expand...
Click to collapse
Yes, the problem with battery drain when not in airplane mode seams to be fixed. It goes to deep sleep ~80% of the time when idle. I'm not sure what was the fix since there was update to LineageOS in between, and I was reflashing two times in the meantime, cleaning caches and restoring backup from recovery, so hard to say.

sc0ty said:
Yes, the problem with battery drain when not in airplane mode seams to be fixed. It goes to deep sleep ~80% of the time when idle. I'm not sure what was the fix since there was update to LineageOS in between, and I was reflashing two times in the meantime, cleaning caches and restoring backup from recovery, so hard to say.
Click to expand...
Click to collapse
Sorry, reading my post I guess was not clear. My phone DOES go to deep sleep when in airplane mode. XT905
============ edit
oh, and almost forgot. I am using Pico Gapps, and turn off auto updates and notifications on play store updates.

Hello, it looks like I'm experiencing the same problem. Battery drain on my photo Q running the last lineage os 14.1 (android 7.1.2).
When on airplane mode the battery drain disappears (even if I can't consider this phone a battery beast).
It seems curious to me, I was imagining that in all these months the problem was corrected.
Do you guys have a suggestion? Many thanks in advance

The thing is that my phone seems to suffer from battery draining (when not on airplane mode) even when running sailfish OS (flashed over cyanogenmod 11).
Could then be possible that it has some kind of hardware problem connected to the gsm/radio part? Except for the battery consumption It works fine tough.

SNS_SMD and RMNET_DFC wakelocks

Greetings, I have a problem with constant wakelocks on my MI11i phone since the day I bought it. Those wakelocks drain battery by 30% overnight, but also cause increased drain during the day in standby too since they instantly kick in as soon as the phone is locked, overall resulting in poor battery life. Even thou I am not an advanced user and has no need of it, I went so far that I completely factory reset the phone(this was the 2nd time), then reflashed new recovery and new official ROM to see will that sort the issue, then for a good measure I also rooted it with TWRP and Magisk. I tried underclocking the cpu to the lowest but it makes no difference while in standby since obviously that isn't the case. I tried using icebox but there were no processes that had SNS or RMNET in their names, so I just froze some analytics apps. Both wakelocks are gone as soon as I turn on the airplane mode or switch to wifi. Any app that can help me freeze those or edit something in kernel?

I found a rom that fixes the wakelock, listed here https://miuiflash.com/roms/miui-csx/alioth/miui-csx-v13-0-8-0-stable-alioth
But i couldn't find a way to contact the author for more info can i fix the kernel myself