I reproduced this behaviour with the nv driver.

Steps to reproduce this bug:
A1. Set brightness at low level (less than middle)
A2. Wait some time for your screen to dim (how long you'll wait depends on your 
setting)
A3. Reactivate screen by moving the cursor
A4. Brightness level is now 50 %

On the contrary,
B1. Set brightness at high level (more than middle)
B2. Wait some time for your screen to dim (how long you'll wait depends on your 
setting)
B3. Reactivate screen by moving the cursor
B4. Brightness level is back at previous setting

I think it's awkward and not power-friendly...

-- 
When the laptop is inactive, screen dims but doesn't remember previous 
brightness setting when reactivited
https://bugs.launchpad.net/bugs/216545
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