I think, that there are some issues mixed!

To make it clear: The current brightness level is not saved at all on shut down.
The setting is read out of System -> Preferences -> Power Management -> "Set 
display brightness to:"
Please set this parameter to a value you like. On start up the brightness will 
always be as you set there.
If not, this is really a bug. So please open a new bug with detailed 
description of your laptop.

If you like, that the current brightness level at shutdown is remembered
on startup, please set the importance to wishlist.

Someone explained a third issue: When laptop is idle it dims the brightness, 
when in active use again the brightness management is confused.
If this is your problem please search related bugs for this problem.

-- 
Laptop TFT monitor - brightness level is not saved
https://bugs.launchpad.net/bugs/35223
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