08-16-2018 09:54 AM
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  1. Syed Minhal Sherazi's Avatar
    My HTC One M8 dies in just about 12h-15h with screen on time of 3h-4h. It is connected to Wi-Fi network 90% of the time and I don't use a cellular data connection. Auto-Sync is on. Screen brightness is either 25% or 50% in direct sunlight. I am on stock 4.4.4 Rom software number 3.28.401.9
    I haven't came across any other M8s so I don't know if the issue is just with my phone. But my roommate has a Xperia Z1 and a friend has SGS4 both get around 30h of battery life with moderate to high use. The standby time is also not so good because I lose about 15%-25% battery in about 3h-4h everyday when I wake up in the morning. I've tried factory resetting my phone thrice but to no avail. I've installed GSAM and included the screenshots. I want to know if its normal and if not what can I do? Would re-flashing the firmware help? If yes how can I flash stock firmware?
    Attached Thumbnails Poor battery life - Kernel os sucking battery-screenshot_2014-11-27-11-09-40.jpg   Poor battery life - Kernel os sucking battery-screenshot_2014-11-27-11-58-53.jpg  
    11-29-2014 01:33 AM
  2. Rukbat's Avatar
    The amount of power the kernel will draw is mainly dependent on the CPU clock speed. Are you running it overclocked?

    Comparing the amount of time a battery lasts between 2 totally different phones is like comparing the gas mileage between a Chevy SUV and a Porsche.

    If the phone isn't being overclocked, I'd see if they'd exchange it. 28% isn't outrageous, but it sounds a bit higher than "just a bit high".
    11-29-2014 01:56 AM
  3. Syed Minhal Sherazi's Avatar
    No I don't know how to overclock the CPU clock speed and it's running the stock un-rooted official firmware.

    It's just that I've read in the reviews that the battery life of HTC One M8 is good and is better than almost all of the 2013 flagships. I'm a bit unsatisfied with the performance.

    Of all the phones I've kept the line's share of the battery was consumed by the screen let alone the kernel and variations of screen brightness had a lot of effect on battery life but that is not the case here.
    11-29-2014 03:37 AM
  4. whitelunchbag's Avatar
    I would try wiping the cache from recovery

    My M8 posted this
    11-29-2014 05:59 AM
  5. neo905's Avatar
    I noticed you don't have power saving on. Have you tried that?

    Posted via the Android Central App
    kct1975 likes this.
    11-29-2014 06:13 AM
  6. Syed Minhal Sherazi's Avatar
    I wiped the cache partition by going in to the recovery it made no difference. I checked the battery saver and things improved but just only a little. No noticeable change.
    11-30-2014 02:51 AM
  7. stefanwi1987's Avatar
    Same problem to me. I also tried wiping the cache partition, even a factory reset didn't help. Android kernel and system are still the top 2 batterie suckers...

    Poor battery life - Kernel os sucking battery-screenshot_2014-11-30-16-16-44.jpg

    I don't know what else to try...
    11-30-2014 10:22 AM
  8. neo905's Avatar
    What version of Google play services do you have?

    Posted via the Android Central App
    11-30-2014 10:31 AM
  9. ramy12's Avatar
    I just had to have Verizon replace my phone for the same issue. I monitored w/ GSAM, turned off everything unnecessary to no avail. I'm hoping when the replacement gets here it will be better but I don't know. I admittedly don't know much about all this but curious if maybe it has something to do with the 4.4.3 or 4.4.4 updates which Verizon got notoriously late and seemed to correlate for my issues (Kernel and Android here too).
    11-30-2014 11:26 AM
  10. stefanwi1987's Avatar
    Play Services are version 6.5.87

    Posted via the Android Central App
    11-30-2014 02:14 PM
  11. sitlet's Avatar
    Same problem here since the 4.4.4 update. With 4.4.3, I was getting horrible battery life, but I never really checked to see what was causing it. When the 4.4.4 update came out, I immediately noticed an increase in battery so I didn't think about it. But after a couple of weeks, I've noticed the same problem. 9/10 days my phone will last less than 12 hours with moderate use. When I first got the phone, it would last almost twice that long with the same usage. The screen was the biggest killer back then, now it's the kernal and OS.
    11-30-2014 02:17 PM
  12. mulder5000's Avatar
    I've had the same kernel/android-system issue since the 4.4.4 update on Sprint. Before the update, I would typically have 50% battery remaining after a 16 hour day with 2-3 hours of screen on time. Now, I'm around 10-15% remaining at the 12 hour mark. Switching runtimes (suggested in another thread), clearing the cache, and factory resetting the phone haven't helped.
    12-01-2014 08:59 AM
  13. stefanwi1987's Avatar
    Yesterday I figured out that the Google Search app was running the whole time (concerning process stats in developer menu). I've deactivated it and look there: Kernel and system are still the top apps in GSam, but my device only used 6% of battery in 10hours (yeah with a very small usage) but that wasn't possible before. The normal consumption was around 1.5-2.0% of battery per hour with the same usage. Maybe you want to give it a try. But be aware: With deactivating the app you won't be possible to use Google Now anymore. Also the Google search bar will disappear and the shortcut (slide up from the home button to open Google Search) will not work.

    I'll continue monitoring it and will give you a feedback.

    Posted via the Android Central App
    12-01-2014 12:47 PM
  14. stefanwi1987's Avatar
    Yesterday I figured out that she Google Search app was running the whole time (concerning process stats in developer menu). I've deactivated it and look there: Kernel and system are still the top apps in GSam, but my device only used 6% of battery in 10hours (yeah with a very small usage) but that wasn't possible before. The normal consumption was around 1.5-2.0% of battery per hour with the same usage. Maybe you want to give it a try. But be aware: With deactivating the app you won't be possible to use Google Now anymore. Also the Google search bar will disappear and the shortcut (slide up from the home button to open Google Search) will not work.

    I'll continue monitoring it and will give you a feedback.

    Posted via the Android Central App
    What I've forgotten to mention: Google Now, hotword detection and so on was deactivated in my configuration before I deactivated the Search app...

    Posted via the Android Central App
    12-01-2014 01:14 PM
  15. sitlet's Avatar
    Anyone have any luck with anything on this? The kernel and Android OS on my phone are using nearly 50% of my battery. When I first got the phone, the two combined would be less than 10%. I used to be able to get through a full day with heavy usage, and now I can barely make it to 6 o'clock without charging.
    12-18-2014 07:14 PM
  16. mulder5000's Avatar
    My battery issue seemed to randomly clear up on it's own but came back again a few days later. In the past two weeks, it's been very inconsistent. Two days ago, I had 58% battery remaining after a 16 hour day. Yesterday, I had 12% with similar usage.
    12-19-2014 10:45 AM
  17. stefanwi1987's Avatar
    The things I've mentioned before also just helped temporarily, but battery life was still very inconsistent. I've shipped my device to HTC to let them fix the issue or to swap the phone. That was 1 week ago. Unfortunately I haven't heard anything from them till now. I hope that I will have my device back before Christmas.

    Posted via the Android Central App
    12-19-2014 05:16 PM
  18. TarekElsakka's Avatar
    I have always had a terrible battery life running Sense (stock, custom, etc.) on this phone, and I must say that it all changed when I converted to GPE (5.0.1) with Elemental X kernel. Now my phone drops to 50% after very heavy usage and about 11 - 12 hours (with 2 hours and 33 minutes of screen on time), so I must say I am impressed with GPE and Elemental X - it's a pretty awesome combination.
    12-19-2014 09:05 PM
  19. sitlet's Avatar
    The things I've mentioned before also just helped temporarily, but battery life was still very inconsistent. I've shipped my device to HTC to let them fix the issue or to swap the phone. That was 1 week ago. Unfortunately I haven't heard anything from them till now. I hope that I will have my device back before Christmas.

    Let us know if you have any luck. I am about to take my phone to Verizon and have them swap it out if this doesn't get any better. Yesterday I had to charge my phone THREE times. It was down to 50% by noon, charged it up, then back to about 40% by 9pm. Now, I did download the new SimCity game, and was playing that throughout the day. But, I only played it for maybe 2-3 mins every half hour. When I first got the phone, I played a racing game for 3 hours straight and only lost 25% battery. The kernel and System combined used about 60% of the battery yesterday, while the SimCity game only used about 9%.

    EDIT: Has anyone had any luck fixing this with a factory reset? I've seen s few people say it didn't help, but not sure if it HAS helped anyone. I would try one, but I don't want to spend a whole day putting my phone back to normal if I don't have to.
    12-21-2014 11:09 AM
  20. stefanwi1987's Avatar
    I did a factory reset for three times. After the last one I didn't install any third party apps except of Gsam to determine if there is an app which kills the battery. That also didn't work... That was the final factor to send the phone back to HTC and let them fix the issue.

    Posted via the Android Central App
    12-22-2014 03:19 PM
  21. stefanwi1987's Avatar
    Well folks, some update on mine. UPS today delivered my device back to me. Concerning to the delivery note they couldn't reproduce the described error. But what I think is that they wiped the complete ROM and did a clean flash of the firmware. That is ok for me because I think that something went wrong during the update and that produced the battery drain.

    The first look is positive for me. It drains much less than before. While the device was on standby in my pocket (3G) for about 2.5 to 3 hours the battery remained on 65%. No drain or even a drop of percentage. Hopefully that will stay this way. I will report my experience with the battery at the next weekend.

    I wish all of you and your families only the best for 2015

    Best regards from Germany,
    Stefan

    Posted via the Android Central App
    12-30-2014 06:10 PM
  22. Super Dave426's Avatar
    Mine did something really weird last night, it was fully charged and I turned it off like I do every night and when I turned it on this morning it was at 92 percent. Usually it will be 98 or 99 after it boots. Also during the day it will discharge slowly until it hits 50 percent and then it discharges twice as fast. Something updated that's chomping power.
    12-31-2014 10:44 AM
  23. sitlet's Avatar
    Update from me, took the phone to verizon. They put it in airplane mode and then did a battery test. It drained a few percent in 10 minutes, to which they estimated it would take 10 hours to fully drain, which they said was on par with the phone's 12 hour standby spec. I went to HTC's site to get the specs, and low and behold, the official standby time is like 40 hours. Showed it to the rep, and he ordered me a replacement right there. I'll let you all know when I get it, but I'm thinking since it seems like a software issue, I don't know if a new phone will help it.
    12-31-2014 11:47 AM
  24. stefanwi1987's Avatar
    Hi everyone,

    The weekend was good on mine. The good battery life i've reported in my last post got stuck after i fully configured my device as I need it. It was poor again with a high usage of Kernel and System. After I noticed that, I did a few steps backward.

    I'm a user of Play Music All Access. I figured out, that the Play Music app has taken a large amount of used resources (used the developer menu, submenu process stats) compared to the other apps / processes. The thing I only did with the Play Music app after i received the phone back from HTC, was to open the app and connect the app with my Google account. I didn't hear any music or downloaded songs. Just opened the app.
    I deactivated the app in the app menu (also cleared the app data and cache), charged the phone to 100% and restarted it with charger connected.

    What shall I say: I've disconnected the phone on Saturday, 10:30 am. Now, almost two and a half days after disconnecting (German time 13:14 p.m.), I still have 47% of battery left with a moderate use and battery saving mode switched on (the performance with activated battery saver is still very high). Android System and Kernel are around 7-8% of battery usage. I'm impressed

    Maybe, the suggestion with Play Music app is helpful for others. I don't know if it is necessary to have a All Access subscription or to only use the app.

    I now made the switch to Spotify. Nice benefit: They had a promo here in Germany: Three months Premium access for €9,99...
    01-05-2015 07:31 AM
  25. sitlet's Avatar
    Hi everyone,

    The weekend was good on mine. The good battery life i've reported in my last post got stuck after i fully configured my device as I need it. It was poor again with a high usage of Kernel and System. After I noticed that, I did a few steps backward.

    I'm a user of Play Music All Access. I figured out, that the Play Music app has taken a large amount of used resources (used the developer menu, submenu process stats) compared to the other apps / processes. The thing I only did with the Play Music app after i received the phone back from HTC, was to open the app and connect the app with my Google account. I didn't hear any music or downloaded songs. Just opened the app.
    I deactivated the app in the app menu (also cleared the app data and cache), charged the phone to 100% and restarted it with charger connected.

    What shall I say: I've disconnected the phone on Saturday, 10:30 am. Now, almost two and a half days after disconnecting (German time 13:14 p.m.), I still have 47% of battery left with a moderate use and battery saving mode switched on (the performance with activated battery saver is still very high). Android System and Kernel are around 7-8% of battery usage. I'm impressed

    Maybe, the suggestion with Play Music app is helpful for others. I don't know if it is necessary to have a All Access subscription or to only use the app.

    I now made the switch to Spotify. Nice benefit: They had a promo here in Germany: Three months Premium access for €9,99...
    Interesting. I checked gsam and it shows Google Music using literally nothing. But when I go to the system stats like you said, it seems to be running all the time. So I disabled the app this morning, and my battery life seems to be a bit better. But the Android System and Kernel are still using almost 40% of the battery.
    01-05-2015 10:09 PM
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