As stated in <https://bugs.launchpad.net/ubuntu/+source/gnome-power-
manager/+bug/121833/comments/11>, you can control brightness using
hotkeys by adding 'options video no_automatic_changes=0' to some file in
/etc/modprobe.d/ and reloading the video module.

I don't know why that change was made, but I think that's what this bug
is about, and not some kde package.

-- 
Inspiron 1420 LCD brightness keys broken
https://bugs.launchpad.net/bugs/140782
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