Here is the relevant hal output for the macbooks:

udi = '/org/freedesktop/Hal/devices/macbook_backlight'
  info.addons = {'hald-addon-macbook-backlight'} (string list)
  info.capabilities = {'laptop_panel'} (string list)
  info.category = 'laptop_panel'  (string)
  info.interfaces = {'org.freedesktop.Hal.Device.LaptopPanel'} (string list)
  info.parent = '/org/freedesktop/Hal/devices/computer'  (string)
  info.product = 'MacBook Backlight Control'  (string)
  info.subsystem = 'unknown'  (string)
  info.udi = '/org/freedesktop/Hal/devices/macbook_backlight'  (string)
  laptop_panel.access_method = 'custom'  (string)
  laptop_panel.num_levels = 118  (0x76)  (int)

So this is probably a bug in hald-addon-macbook-backlight.  But the
original bug reporter is not using a macbook.  If you're having this
issue with a macbook, please open a new bug report with 'ubuntu-bug hal'
and describe what you're seeing.

** Summary changed:

- Strange LCD brightness up function implementation
+ Strange LCD brightness up function implementation on the Acer Aspire 5720

-- 
Strange LCD brightness up function implementation on the Acer Aspire 5720
https://bugs.launchpad.net/bugs/360795
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