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