> if the udev keymap is disabled, the keys work as expected without
problems. they show up in acpi_listen and dmesg output as shown above.

That's all with acpi-support purged? It's probably that your brightness
keys are hardwired and directly control the brightness in hardware. Then
the key events are merely used to giving visual feedback (the
notification bubbles which show the percentage).

> when we hit lowest possible brightness, something interesting happens:
single press of the BrightnessDown key generates this:

If you already purged acpi-support and stopped acpid, then it's not that
any more, so for some reason the kernel duplicates these input events.
It looks like the udev mapping is not actually required, and the default
kernel already provides the correct key codes itself. But then setting
the same values again in udev shouldn't really change things.

So this effect seems to be an independent problem in the kernel, as far
as I can see.

-- 
hotkey-setup support for MSI PR200
https://bugs.launchpad.net/bugs/178860
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