Story of a laptop user
    Adrian Chadd 
    adrian at freebsd.org
       
    Wed Feb  5 18:25:05 UTC 2014
    
    
  
hi,
Try (if I'm reading your dump correctly):
_SB.PCI0.PEG0.VGA.LCD._BCM
_SB.PCI0.PEG1.VGA.LCD._BCM
_SB.PCI0.GFX0.DD02._BCM
.. god I wish we had a way to actually just dump the tree in a useful
fashion to inspect what objects there are.
Anyway, do the acpi_call hacks to various nodes that have _BCM in them
and see if setting any of them changes your brightness.
-a
    
    
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