@Colin, neither the keys work (no brightness changes), nor do you get
any notification bubble.

The Macbook has no ACPI backlight driver and /sys/class/backlight is
empty.

This has an upstream bug now at 
https://bugs.freedesktop.org/show_bug.cgi?id=25901
A patch has been posted there but not gone into any upstream.

** Bug watch added: freedesktop.org Bugzilla #25901
   https://bugs.freedesktop.org/show_bug.cgi?id=25901

-- 
FN Brightness keys stopped working on Macbook4,1
https://bugs.launchpad.net/bugs/509508
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