#11286 NORM 12.1.0: powerd should not suspend on open external serial devices

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#11286: powerd should not suspend on open external serial devices
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           Reporter:  greenfeld               |       Owner:  pgf                              
               Type:  enhancement             |      Status:  new                              
           Priority:  normal                  |   Milestone:  12.1.0                           
          Component:  power manager (powerd)  |     Version:  Development build as of this date
         Resolution:                          |    Keywords:                                   
        Next_action:  design                  |    Verified:  0                                
Deployment_affected:                          |   Blockedby:                                   
           Blocking:                          |  
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Comment(by pgf):

 as for mailbox locking, there are multiple standards for serial locking.
 but on a given system, all clients must use the same locking protocol,
 otherwise the locking is useless.

 any such locking is advisory -- i.e., minicom is free to open ttyUSB0
 anyway, even if it's already locked by picocom.  but that would be very
 unfriendly.

 so i think it's sufficient -- if the device isn't locked, no one can be
 doing anything of interest with it, and we should go ahead and suspend.

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Ticket URL: <http://dev.laptop.org/ticket/11286#comment:6>
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