How to Set Startup Display Brightness in Linux Mint 14
1. Open a terminal window.
2. Type in the following commands then hit Enter after each.
sudo apt-get install xbacklight
3. Open the Startup Applications Preferences menu.
4. Click the Add button and add the following information:
Command: xbacklight -set 60
5. Replace 60 with whatever brightness level you prefer.
Additional Linux Mint Resources
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For more information, see the original article:
How To Force Set Display Brightness On Startup Under Ubuntu 12.10/12.04/Linux Mint 14/13 | Up Ubuntu