[Trac #407] Dcon manager emits misleading errors

[Zarro Boogs per Child]

#407: Dcon manager emits misleading errors
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 Reporter:  marco   |       Owner:  marco  
     Type:  defect  |      Status:  new    
 Priority:  normal  |   Milestone:  BTest-2
Component:  sugar   |    Keywords:         
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 Splitted from #361

 Adjusting the backlight also gives a misleading error message on the
 console terminal:

 Error:root:Invalid backlight level 16

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Ticket URL: <http://dev.laptop.org/ticket/407>
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