This appears to be a two part problem:

1.  HAL doesn't let guidance-powermanager have access to the required
device:

Warning: in getBrightness():
org.freedesktop.Hal.Device.PermissionDeniedByPolicy: org.freedesktop.hal
.power-management.lcd-panel no <-- (action, result)

2.  guidance-powermanager then crashes because it doesn't have an old
brightness value:

  File "/usr/share/python-support/kde-guidance-powermanager/powermanage.py", 
line 287, in getBrightness
    return self.old_b
AttributeError: PowerManage instance has no attribute 'old_b'


** Changed in: hal (Ubuntu)
   Importance: Undecided => Medium

** Changed in: hal (Ubuntu)
       Status: New => Confirmed

-- 
Cancel button in kde-guidance-powermanager doesn't do anything
https://bugs.launchpad.net/bugs/183656
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