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UI is not responsive at low battery level <10% [released]

asked 2013-12-26 12:36:26 +0300

pazix gravatar image

updated 2014-02-09 16:14:03 +0300

foss4ever gravatar image

UI is stalling when battery level goes low. UI can be few seconds not responsive. After stalls it is working properly.

Version (Laadunjärvi), and

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The question has been closed for the following reason "released in a software update" by molan
close date 2014-07-17 10:37:21.455939


I noticed this behavior too

Chiku ( 2013-12-26 14:37:37 +0300 )edit

This problem seems to exists still on Phone seems to get stuck couple of seconds before getting low battery warning and after warning is gone phone is again usable until it will note about low battery again.

junnuvi ( 2013-12-31 06:43:31 +0300 )edit

Yes agreed, furthermore, the level drops from 10% to switch off in about 10min with 3g and idle. The scale shall be updated as the user thinks in battery live time and not in voltage %. At least this is a guess.

damourti ( 2014-01-10 01:43:03 +0300 )edit

I have experienced this problem as well, from the moment the battery goes below 10 % the UI is completely unresponsive for a good 10 seconds, then it works again for about a minute and then it freezes again, etc.

nthn ( 2014-02-07 22:10:32 +0300 )edit

2 Answers

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answered 2014-01-09 14:06:22 +0300

Venemo gravatar image

updated 2014-01-09 14:15:19 +0300

(Sorry, this is not answer but the text is loo long for a comment.)

When the battery is very low (approx. < 10%), the device can become extremely unresponsive from time to time. It seems that something is happening periodically that consumes so much CPU power that there's nothing else left for the rest of the system.

Symptoms: the whole UI freezes for 10-15 seconds, including the home screen, all system gestures and the app in the foreground.

Some observations:

  • When I SSH in and run top in the terminal, it tells me that a process called upowerd comes up periodically and takes >90% of the CPU.
  • If I happen to be listening to music while this happens, the music stutters as long as this weirdness is going on.
  • It doesn't matter what's in the foreground, the UI just completely freezes. Meaning: the screen doesn't get updated at all and doesn't respond to any input.
  • If I turn the device ON in a low-battery condition, the same effect is noticable on the SIM and the lock code entry dialogs.
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Good to have that additional info here..

foss4ever ( 2014-01-09 14:10:37 +0300 )edit

There is a high cpu usage bug reported of upowerd.

jsiren ( 2014-01-09 17:23:07 +0300 )edit

@jsiren Not quite recent bug (over three years old) and being Ubuntu-spesific so I doubt it is relevant here.

foss4ever ( 2014-01-10 02:28:32 +0300 )edit

I've come across this as well. Approximately one per minute or so (at least when this ladt happened to me) the UI froze completely for 5-10sec, then I'd get the low battery beep and after that everything went back to normal for about 45sec or so until it happened again.

typo ( 2014-01-20 22:22:16 +0300 )edit

@typo Yes, exactly like that here too.. and if you keep using device thru abt 10 stalls like this it will eventually power-off. (so it loses 10 % of battery juice in 10 minutes, whatever units they maybe).

foss4ever ( 2014-01-20 22:30:14 +0300 )edit

answered 2013-12-26 16:17:32 +0300

jsiren gravatar image

The reason seems to be aggressive power saving. The system seems to drop CPU frequency to a minimum when working with a low battery. Perhaps this could be addressed together with the NFC bug?

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Issue is not TOH related, because update not fix it. May be UI freezing shorter time, but UI still freezing.

pazix ( 2014-02-04 22:08:05 +0300 )edit

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Asked: 2013-12-26 12:36:26 +0300

Seen: 675 times

Last updated: Feb 04 '14