I have seen this too and the behavior seems to have changed recently.
Intuitively I noticed something. If I turn the brightness  all the way
down I see something like what you are referring to. If I leave the
keyboard idle, the screen goes to a brighter setting (but not the
brightest). If I turn the brightness all the way up, and leave the
keyboard idle, it goes to a dimmer setting (but not the dimmest)

Before recent updates:
I think what's happening is something like this. Imagine you have 10 brightness 
settings from 1-10 with 10 being the brightest and the default. If you leave 
the keyboard idle for a while it goes to 3. If you had your brightness at the 
default (or anything higher than 3) then you would see the correct behavior of 
it getting dimmer. If you happened to have had your brightness at 2 or 1, and 
left the keyboard idle then going to 3 would actually be brighter.

Most recent versions:
Sometime this past week the behavior seems to have changed as follows. Now it 
*does* seem to just go to the brightest setting on idle if I had set it at the 
dimmest. This is quite annoying at night time. I am not sure if this is some 
kind of wrap-around effect on the brightness setting.

I suspect someone tried to fix this recently and took the wrong
approach. What it should do on idle is bring it to the dimmest setting
or at least just leave it as dim as the user had it before going idle
(not brighter or brightest!).

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https://bugs.launchpad.net/bugs/842459

Title:
  screen brightness is inverted

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