After some investigation, it seems like the actual bug has nothing to do
with keymap.

Fn+F5/F6 actually does work.  Keypresses are recognized as ACPI events
(see comment #1 above), and keymap does not show anything ever.

Currently brightness level goes something like this:
Left hand side: what NotifyOSD tells me
Right hand side: actual brightness, compared to what I see in Windows (approx)

50% = very bright - probably 100%  -- cannot go above this level!
40% = about 30% brightness
25% = about 50% brightness
10% = about 70% brightness
0% = about 10% brightness

And then, after reaching 0%, when I press brightness down again,
Brightness control stops responding to any of my input (it seems to
"freeze" for a while).


So the current workaround would be to make sure that you don't press Fn+F5 too 
many times and just live with mismatch of brightness levels.

-- 
brightness hotkeys don't work as expected, asus ul30a
https://bugs.launchpad.net/bugs/543294
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