#10139 NORM Not Tri: charger causes many spurious SCI events

[Zarro Boogs per Child]

#10139: charger causes many spurious SCI events
---------------------------------+------------------------------------------
 Reporter:  pgf                  |                 Owner:  rsmith                            
     Type:  defect               |                Status:  new                               
 Priority:  normal               |             Milestone:  Not Triaged                       
Component:  embedded controller  |               Version:  Development source as of this date
 Keywords:                       |           Next_action:  never set                         
 Verified:  0                    |   Deployment_affected:                                    
Blockedby:                       |              Blocking:                                    
---------------------------------+------------------------------------------
 was using C2 unit, running q3a37.  unit ran down enough
 that it shut down automatically.

 applied power, led went into 4-flash mode, indicating trickle charging.
 was debugging powerd at the time, and noticed the
 AC online status was changing a lot.  looked at dmesg:

 {{{
   292.958159] olpc-pm-1.5: SCI 0x0 received
 [  293.085534] olpc-pm-1.5: SCI 0x40 received
 [  293.089593] olpc-pm-1.5: SCI 0x0 received
 [  294.628768] olpc-pm-1.5: SCI 0x40 received
 [  294.640743] olpc-pm-1.5: SCI 0x0 received
 [  294.873084] olpc-pm-1.5: SCI 0x40 received
 [  294.877140] olpc-pm-1.5: SCI 0x0 received
 [  295.374424] olpc-pm-1.5: SCI 0x2 received
 [  295.377484] olpc-pm-1.5: SCI 0x0 received
 [  296.090443] olpc-pm-1.5: SCI 0x40 received
 [  296.110222] olpc-pm-1.5: SCI 0x0 received
 [  296.324161] olpc-pm-1.5: SCI 0x40 received
 [  296.329256] olpc-pm-1.5: SCI 0x0 received
 [  298.643881] olpc-pm-1.5: SCI 0x2 received
 [  298.646950] olpc-pm-1.5: SCI 0x0 received
 [  298.801541] olpc-pm-1.5: SCI 0x40 received
 [  298.820364] olpc-pm-1.5: SCI 0x0 received
 [  299.003257] olpc-pm-1.5: SCI 0x40 received
 [  299.006352] olpc-pm-1.5: SCI 0x0 received
 [  300.418134] olpc-pm-1.5: SCI 0x40 received
 [  300.433009] olpc-pm-1.5: SCI 0x0 received
 [  300.450626] olpc-pm-1.5: SCI 0x40 received
 [  300.454664] olpc-pm-1.5: SCI 0x40 received
 [  300.458694] olpc-pm-1.5: SCI 0x0 received
 [  300.692440] olpc-pm-1.5: SCI 0x40 received
 [  300.696497] olpc-pm-1.5: SCI 0x0 received
 [  301.680145] olpc-pm-1.5: SCI 0x40 received
 [  301.683194] olpc-pm-1.5: SCI 0x0 received
 [  301.702237] olpc-pm-1.5: SCI 0x40 received
 [  301.706289] olpc-pm-1.5: SCI 0x0 received
 [  301.961056] olpc-pm-1.5: SCI 0x2 received
 [  301.963079] olpc-pm-1.5: SCI 0x0 received
 [  302.342974] olpc-pm-1.5: SCI 0x40 received
 [  302.365396] olpc-pm-1.5: SCI 0x40 received
 [  302.375636] olpc-pm-1.5: SCI 0x40 received
 [  302.379667] olpc-pm-1.5: SCI 0x0 received
 [  302.398425] olpc-pm-1.5: SCI 0x40 received
 [  302.415484] olpc-pm-1.5: SCI 0x0 received
 [  302.818628] olpc-pm-1.5: SCI 0x40 received
 [  302.830597] olpc-pm-1.5: SCI 0x0 received
 [  302.998921] olpc-pm-1.5: SCI 0x40 received
 [  303.010812] olpc-pm-1.5: SCI 0x0 received
 [  303.596949] olpc-pm-1.5: SCI 0x40 received
 [  303.611925] olpc-pm-1.5: SCI 0x0 received
 [  303.804111] olpc-pm-1.5: SCI 0x40 received
 [  303.808169] olpc-pm-1.5: SCI 0x0 received
 [  306.348070] olpc-pm-1.5: SCI 0x2 received
 [  306.351169] olpc-pm-1.5: SCI 0x0 received
 [  306.922351] olpc-pm-1.5: SCI 0x40 received
 [  306.944784] olpc-pm-1.5: SCI 0x40 received
 [  306.955025] olpc-pm-1.5: SCI 0x40 received
 [  306.963172] olpc-pm-1.5: SCI 0x0 received
 [  306.982097] olpc-pm-1.5: SCI 0x40 received
 [  306.986135] olpc-pm-1.5: SCI 0x40 received
 [  306.994475] olpc-pm-1.5: SCI 0x0 received
 [  307.007330] olpc-pm-1.5: SCI 0x40 received
 [  307.023467] olpc-pm-1.5: SCI 0x0 received
 [  307.473435] olpc-pm-1.5: SCI 0x40 received
 [  307.476484] olpc-pm-1.5: SCI 0x0 received
 [  307.498666] olpc-pm-1.5: SCI 0x40 received
 [  307.502901] olpc-pm-1.5: SCI 0x0 received
 [  308.540316] olpc-pm-1.5: SCI 0x40 received
 [  308.543365] olpc-pm-1.5: SCI 0x0 received
 [  308.797468] olpc-pm-1.5: SCI 0x40 received
 [  308.810445] olpc-pm-1.5: SCI 0x0 received
 [  310.096093] olpc-pm-1.5: SCI 0x40 received
 [  310.099141] olpc-pm-1.5: SCI 0x0 received
 [  310.362231] olpc-pm-1.5: SCI 0x40 received
 [  310.366288] olpc-pm-1.5: SCI 0x0 received
 [  311.825947] olpc-pm-1.5: SCI 0x2 received
 [  311.828971] olpc-pm-1.5: SCI 0x0 received

 }}}

 noticed that the LED didn't _always_ do 4 flashes.  sometimes just 1 or 2,
 then steady for a while.

 charge level indicated 25%, rose to 26% and later 27% while i was
 watching.  kernel property "charge_type" indicated "Fast", not "Trickle",
 as i would have expected.

 alas, no EC serial.

 power supply is an older green one.

 ah ha!   it's the charger.  this is a charger i brought from home, because
 i'd observed some odd behavior with it earlier.  powering from a different
 (green) charger doesn't show the problem.  switching back starts it
 happening again, reliably.

-- 
Ticket URL: <http://dev.laptop.org/ticket/10139>
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