#10154 HIGH 1.5-sof: wifi device frequently disappears after lid-suspend

Zarro Boogs per Child bugtracker at laptop.org
Mon May 10 22:11:09 EDT 2010

#10154: wifi device frequently disappears after lid-suspend
           Reporter:  dsd       |       Owner:  cjb                
               Type:  defect    |      Status:  new                
           Priority:  high      |   Milestone:  1.5-software-update
          Component:  kernel    |     Version:  not specified      
         Resolution:            |    Keywords:                     
        Next_action:  diagnose  |    Verified:  0                  
Deployment_affected:            |   Blockedby:                     
           Blocking:            |  

Comment(by Quozl):

 I've tested 20 cycles of lid close suspend and resume on os123 without
 reproducing this fault.

 I've looked carefully at the message log provided by Dan; stripping the
 timestamps and running a visual diff against each S/R cycle.

  * there were no lid wake-ups, which is inconsistent with the problem
 report, and has me confused, (the wake-up sources were ''rtc alarm, ec,
 ec, rtc alarm, rtc alarm, ec, ec, power button, ec, power button, ec,
 power button'')
  * in all but the last resume, any powered down card is powered up and
 requests firmware,
  * the second last resume was woken by EC,
  * the last suspend intended to power down the card,
  * the last resume was woken by power button, and it did not request
  * ''egrep 'wakeup_source|mmc1|libertas' wifi-disappeared.txt'' showed
 that after the last resume the message pattern matches the non-powered
 down case, and the wakeup happened very soon (220ms) after power was
 turned off to mmc1.

 Is there a possibility of electrostatic discharge in that environment?
 (ESD can cause misbehaviour as well as damage).

Ticket URL: <http://dev.laptop.org/ticket/10154#comment:6>
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