Ok, I think I may have found out what's causing the problem in my case.
After booting, there is just one notify-osd process running. If I press
volume increase/decrease keys, I get one notification, as expected.
However, if I try to change the brightness using the brightness keyboard
keys, another notify-osd process gets started by root. From that point
on, I keep getting two notifications for any event.

So, changing the brightness somehow requires higher privileges, and
hence a new notify-osd process under root is started.

Does this make sense? Any idea why brightness should require superuser
privileges?

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notify-osd shows double image for screen brightness control
https://bugs.launchpad.net/bugs/345251
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