#12525 NORM 4-firmw: XO-4 EC communication problem

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#12525: XO-4 EC communication problem
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           Reporter:  wad                  |       Owner:  rsmith                            
               Type:  defect               |      Status:  new                               
           Priority:  normal               |   Milestone:  4-firmware                        
          Component:  embedded controller  |     Version:  Development source as of this date
         Resolution:                       |    Keywords:  XO-4, EC                          
        Next_action:  diagnose             |    Verified:  0                                 
Deployment_affected:                       |   Blockedby:                                    
           Blocking:                       |  
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Comment(by pgf):

 shortest reproducer:

 {{{
   ok " mouse" open-dev close-dev s3-selftest
   ok .bat many

 < now use the touchpad >
 }}}

 it seems the EC can get confused (and refuse to run interrupt handlers) if
 it gets simultaneous interrupts under some conditions.  at least, that's
 the current theory, and avoiding get touchpad/keyboard interrupts along
 with ACK interrupts seems to prevent the current bug.

 workedaround in EC commit 9def2826f.

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Ticket URL: <http://dev.laptop.org/ticket/12525#comment:12>
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