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[Q] Phone lag when battery is low

OP koolaid159357

24th August 2014, 11:18 PM   |  #1  
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Has anyone else notice that their M8 is noticeably less responsive when the battery gets low (usually under 15%)? I am aware that the Verizon model does not have the extreme power saving mode feature; however, I noticed something funny. When the battery is low and I go into developer options to turn on high performance mode, it lets me know that I cannot due to power saver being on (see screenshot). When the phone's battery is not low, I do not see this message and I can enable high performance mode. My guess is that the phone is entering some sort of power saving mode automatically when the battery gets low because I notice that it lasts quite long on low battery and is less snappy.
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25th August 2014, 04:18 AM   |  #2  
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Fast start to finish here. But I'm running custom so.

Sent from my HTC One_M8 using Xparent BlueTapatalk 2
5th September 2014, 05:39 AM   |  #3  
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Can anyone else on stock replicate this issue or did I just get a defective M8? Thanks!
5th September 2014, 10:57 AM   |  #4  
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Quote:
Originally Posted by koolaid159357

Can anyone else on stock replicate this issue or did I just get a defective M8? Thanks!

It honestly sounds like power saving mode is kicking in. Which does at 15% on stock if power saving mode is enabled ( not extreme power saving mode just the standard one)
If something weird is going on and it is not providing you with a notification that it is what's happening, next time it happens look at /sys/devices/system/cpu/cpu0/scaling_max_freq if it's at 2265600 then it's not in power saving mode, however if it's at 1190400 then power saver is on. Other signs of power saving mode would "normally" be
Display brightness reduced
Cpu reduced speeds
Vibration feedback turned off
*data connection put to sleep when screen off

Edit:
Turned my power saving mode on and I also can not turn on high performance mode. So I bet that is EXACTLY what's going on.

last edit,
if you have root you can launch the power saving settings ( even tho the option is not there under the power sub menu vzw left all the code in)
to do this from terminal emulator at # am start -a android.intent.action.MAIN -n com.htc.htcpowermanager/com.htc.htcpowermanager.powersaver.PowerSaverActiv ity
this will launch the settings for power saving mode, and from here you can see if it is set to on, if so just turn it back off.

sent from space
Last edited by runandhide05; 5th September 2014 at 11:33 AM.
6th September 2014, 09:59 PM   |  #5  
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Quote:
Originally Posted by runandhide05

It honestly sounds like power saving mode is kicking in. Which does at 15% on stock if power saving mode is enabled ( not extreme power saving mode just the standard one)
If something weird is going on and it is not providing you with a notification that it is what's happening, next time it happens look at /sys/devices/system/cpu/cpu0/scaling_max_freq if it's at 2265600 then it's not in power saving mode, however if it's at 1190400 then power saver is on. Other signs of power saving mode would "normally" be
Display brightness reduced
Cpu reduced speeds
Vibration feedback turned off
*data connection put to sleep when screen off

Edit:
Turned my power saving mode on and I also can not turn on high performance mode. So I bet that is EXACTLY what's going on.

last edit,
if you have root you can launch the power saving settings ( even tho the option is not there under the power sub menu vzw left all the code in)
to do this from terminal emulator at # am start -a android.intent.action.MAIN -n com.htc.htcpowermanager/com.htc.htcpowermanager.powersaver.PowerSaverActiv ity
this will launch the settings for power saving mode, and from here you can see if it is set to on, if so just turn it back off.

sent from space

Thanks for the reply, I agree with you on that one, I'm pretty sure power saving mode is being turned on somehow. I'm not rooted and on stock, so I don't have a toggle for power saver mode. Any idea how it could have turned itself on? Aside from rooting, is there anything short of a factory reset that I can do to get rid of it?
6th September 2014, 11:07 PM   |  #6  
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Quote:
Originally Posted by koolaid159357

Thanks for the reply, I agree with you on that one, I'm pretty sure power saving mode is being turned on somehow. I'm not rooted and on stock, so I don't have a toggle for power saver mode. Any idea how it could have turned itself on? Aside from rooting, is there anything short of a factory reset that I can do to get rid of it?

Well I would first ask if any of the things I said happen when you phone goes below 15% such as
Display brightness reduced
Cpu reduced speeds
Vibration feedback turned off
*data connection put to sleep when screen off
Some of these you can check without root. Like the screen gets dim or the vibration turns off. If so then let me know.
Theoretically a factory reset would clear it. However you could try to clear data from the settings app.
sent from space
Last edited by runandhide05; 6th September 2014 at 11:16 PM.
9th September 2014, 12:24 AM   |  #7  
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+1 on Power Save coming on.....I am on Viper so I see it is turned on at 15% with the quick settings, so I tap it to turn it off (which I know there isn't a stock equivalent)....but when it is on...the phone slows like a turd.

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