#11982 BLOC 12.1.0: XO-1.5 os16 runin hang

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#11982: XO-1.5 os16 runin hang
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           Reporter:  Quozl     |       Owner:  dsd                              
               Type:  defect    |      Status:  assigned                         
           Priority:  blocker   |   Milestone:  12.1.0                           
          Component:  kernel    |     Version:  Development build as of this date
         Resolution:            |    Keywords:                                   
        Next_action:  diagnose  |    Verified:  0                                
Deployment_affected:            |   Blockedby:                                   
           Blocking:            |  
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Comment(by greenfeld):

 I setup a few more XO-1.5s with serial support.

 The only hang that has appeared with runin running so far is the
 "Restarting Tasks..." one with no "Done" message appearing.  Sometimes the
 DCON returning control to CPU is mentioned after this message, but nothing
 else.

 Hangs in runin seem to happen sooner than the alternate hang scenarios
 seen outside of runin.

 Testing so far suggests:
  * Disabling pm_async via sysfs to force synchronous suspending does not
 solve the problem.
  * Blacklisting the libertas and libertas_sdio modules and disabling
 runin-wlan does not solve the problem.  (This was done independently of
 the pm_async test.)

 There have been multiple runin failures due to the battery test not seeing
 enough discharging (12-16 percent instead of 20).  This could be due to
 aggressive suspending being enabled, and the lack of camera/etc. testing.
 I have tweaked the battery values locally in runin-battery so this should
 happen less often.

 While libertas is blacklisted (and sometimes without) I often see -22 MMC
 errors and a failure to negotiate a proper voltage for the card.  This
 will be filed as a separate ticket.

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Ticket URL: <http://dev.laptop.org/ticket/11982#comment:17>
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