For me it's

sudo setkeycodes e008 136
sudo setkeycodes e009 137

that silences the kernel. After that lshal -m sees the keypresses as:

09:11:00.004: platform_i8042_i8042_KBD_port_logicaldev_input condition 
ButtonPressed = find
09:11:00.316: platform_i8042_i8042_KBD_port_logicaldev_input condition 
ButtonPressed = cut

which probably is the real problem together with the fact that the
keycodes are not enabled by default.

OTOH it seems that now almost all special keys have this behaviour,
which means that they can be made to do the right thing in the future.
Previously they just did nothing.

As a workaround I installed the xbacklight package and bound <Super>-B
and <Super>-V to "xbacklight -inc 10" and "xbacklight -dec 10"
respectively.

This bug is still highly inconvenient though...

-- 
[regression] Brightness hotkeys don't work anymore
https://bugs.launchpad.net/bugs/216436
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