#11793 NORM 12.1.0: Battery light flashes red on 100% charge

Zarro Boogs per Child bugtracker at laptop.org
Tue Apr 30 22:09:26 EDT 2013

#11793: Battery light flashes red on 100% charge
           Reporter:  tonyforster          |       Owner:  pgf          
               Type:  defect               |      Status:  reopened     
           Priority:  normal               |   Milestone:  12.1.0       
          Component:  embedded controller  |     Version:  not specified
         Resolution:                       |    Keywords:               
        Next_action:  never set            |    Verified:  0            
Deployment_affected:                       |   Blockedby:               
           Blocking:                       |  

Comment(by rsmith):

 Replying to [comment:9 peasthope]:

  [olpc at xo-53-1d-bb ~]$ cat /sys/class/power_supply/olpc-battery/error

 Error 12 is no voltage change error. Meaning that the voltage stayed the
 same for > 4 minutes.  Its possible your battery is just going bad.  You
 should establish a baseline by doing the following.

 Charge battery
 then in terminal do:
 - Stop powerd. 'sudo service powerd stop'
 - run olpc-pwr-log unplug external power and let it run until it powers

 Then remove battery and re-connect power and boot back up to terminal and
 - Stop powerd. 'sudo service powerd stop'
 - run olpc-pwr-log
 - insert battery

 Once the battery had charged back up attach both of the power logs.

  > Isn't logging suspended when the screen goes black after an idle time.
 > I don't know what to call the state.  Hibernation, suspended,
 > quiescent?

 You said you were running an audio app playing a .wav file in repeat mode.
 I assumed that was to prevent suspend.  Yes the logging would be suspended
 if the XO goes into suspend.

 In any case the above baseline won't suspend and will most likely show
 whats going on.

 > Is there a time stamp encoded in the log?


 > Wouldn't automatic shutdown before the red light be preferable
 > to shutdown after the flashing red has begun?

 Automatic shutdown occurs when energy level of the battery drops to a
 level where hard power off is minutes away.  The red led comes on any time
 the remaining capacity is < 10% which is quite a ways from automatic

 Flashing red is an error.  If you have a flashing red then the battery
 system has  halted.  Depending on what the error is nothing else in the
 battery system may be valid.

Ticket URL: <http://dev.laptop.org/ticket/11793#comment:10>
One Laptop Per Child <http://laptop.org/>
OLPC bug tracking system

More information about the Bugs mailing list