I managed to fine-tune the LCD brightness to a greater degree by adding the 
'Brightness Applet' to the Gnome Panel.
1.Right-click a specified location on the Gnome Panel and select 'Add to 
Panel...'
2.Select 'Brightness Applet'.

To achieve 7 adjustable levels of brightness on the function keys (instead of 
the usual 3), and to keep the LCD brightness from being set at the maximum 
after every reboot:
1.In a terminal, type “gksudo gedit”.
2.Open the file “/etc/modprobe.d/blacklist”.
3.Add a new line “blacklist video”.
4.Reduce brightness to mimimum (or desired level).
5.Reboot.

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