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

Zarro Boogs per Child bugtracker at laptop.org
Wed May 8 10:13:58 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:11 peasthope]:
 > Replying to [comment:10 rsmith]:
 > > Once the battery had charged back up attach both of the power logs.
 > Attached.  Sorry for the reversed order.

 Thanks.  So your battery seems to be fine.  A minor problem is that you
 are experiencing the "end of the rope" bug in the ACR register that was
 fixed in 1.75 and XO-4.  I'll take a look at backporting that fix into 1.5
 EC code.

 The bug isn't the cause of your problems. I just means that the watt-hour
 measurement for the charging log won't be correct.  The EC doesn't use
 that that value to determine full so its mostly harmless.

 So now please duplicate the conditions that cause the flashing red and the
 quick yellow to green transition.

 Its not clear in your earlier test if the laptop is suspending or not.
 For now just run your test as you have before but please run olpc-pwr-log
 first.  Even if the laptop is suspending it will wake up on 1% battery SOC
 changes and log the results.

 When you get a flashing red please follow this sequence:

 Plug up external power and stop at OFW by pressing the esc key when you
 hear the startup sound.  Then at the ofw 'ok' prompt run 'watch-battery'
 when watch-battery starts showing battery info (which won't be correct due
 to the errror) hit a key to exit 'watch-battery' it will then print out
 what the error is.

 Make a note of the error and then remove all power from the laptop both
 external power and the battery.  Then only connect up external power (no
 battery) boot the laptop up to terminal and stop powerd 'sudo service
 powerd stop' then run 'olpc-pwr-log'. It will wait for you to insert the

 Insert the battery and let it charge.  Repeat this entire scenario until
 you capture the conditions where you see the very quick yellow to green

Ticket URL: <http://dev.laptop.org/ticket/11793#comment:12>
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