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Drain Battery: GPS kernel wakelock

27th January 2012, 02:25 PM |#1  
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Hello, thanks to "Better Battery Stats" (http://forum.xda-developers.com/show....php?t=1179809), I've seen that after using the GPS with Google Maps (after using it I turned off the GPS), the phone does'nt enter into deep sleep, remains awake, drying the battery.

BBS shows that the process "GPS" (under "Kernel Awake") never ends, and the only way to end it is to restart the terminal. The drying is especially evident in the night (one night in my deep sleep or battery dropped to 1%, but with the process "GPS kernel awake" the battery loses 25-30%)

I'dont know if this is a problem of some ROMs, Kernels, Google Maps, etc. because I read that also happens in other devices (http://forum.xda-developers.com/show....php?t=1419087; http://forum.xda -developers.com/sho...p? t = 1442368)

I'm using: MiniCM7-2.1.6, Kernel, (thanks to @nobodyAtall for this great ROM-kernel), Undervolt, SmartassV2 and min CPU to 19Mhz.

I can add:

1) the problem no depends on the program, simply turn on the GPS on the Widget energy of the status bar and after turn it off, and the "GPS process" start and never ends, draining the battery.
It also happens with other programs besides Google Maps: AlpineQuest, GPS Status

2) If you turn off GPS you must restart the device to no leave running "GPS process"
Another solution is to restart the device with the GPS on and not turn off ever. With this the "GPS process" does'nt stuck and the battery will not dry. You can use Google Maps (or other application), the GPS works well and when you come out of the application does'nt happen that the "GPS process" keep the device awake drying the battery. Also, my experience is that leaving the GPS always on does'nt waste a lot of battery, if you are'nt using an application that uses it.
Last edited by APD500; 30th January 2012 at 06:45 PM.
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27th January 2012, 03:52 PM |#2  
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Under investigation

will try to find solution about this problem
27th January 2012, 06:37 PM |#3  
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Same here, im using nAa minicm7 2.17 + 09 kernel, after turn off the gps, with airplane mode my batery drain 2-3% por hour.

Restart the phone solved it.

enviado desde mi x8 E15a
Last edited by panchuckles; 27th January 2012 at 07:01 PM.
19th February 2012, 05:33 AM |#4  
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are you guys using facebook app?
by freezing it in titanium backup, it looks like can cure the problem. GPS wake time not increasing...
26th April 2012, 07:34 AM |#5  
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Hello, I'm on the Galaxy Note and I found that I'm having the same issue. I saw the remarks about Facebook. I just completely uninstalled it. Let's see if that helps! I'll post back .
26th April 2012, 08:51 AM |#6  
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yes fb app is comsume many battery
28th April 2012, 02:40 AM |#7  
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Interesting research, gonna try your suggestions on my X8.
28th April 2012, 08:15 AM |#8  
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OT: try Fast Facebook rather than FB main app
29th April 2012, 03:23 PM |#9  
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I can confirm that this happens on my X8 also. The rebooting with GPS turned on option is no good for me because most apps try to use GPS for whatever reason.

There seems to be more info here: http://forum.xda-developers.com/show....php?t=1128135
3rd September 2012, 09:31 PM |#10  
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So, any news on this? I'm on MiniCM and this wakelock thing still happens.
Last edited by Dexter_prog; 3rd September 2012 at 10:07 PM.

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