[Trac #555] Add PM event for battery status change

[Zarro Boogs per Child]

#555: Add PM event for battery status change
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 Reporter:  krstic       |        Owner:  ted.juan
     Type:  enhancement  |       Status:  new     
 Priority:  normal       |    Milestone:  BTest-2 
Component:  hardware     |   Resolution:          
 Keywords:               |  
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Comment (by hughsient at gmail.com):

 Replying to [ticket:555 krstic]:
 > or every time the percentage changes.

 This is best from a HAL POV, as the kernel can emit a netlink message on
 value change.

 Richard.

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Ticket URL: <http://dev.laptop.org/ticket/555#comment:5>
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