backlight/brightness function keys

I've never had the function keys for brightness work on the HP 4340s - the icon comes on screen, but the brightness is unaffected .

I found this:

http://www.upubuntu.com/2013/04/fix-brightness-keys-not-working-on.html

and did it, and it worked, but following boot the screen defaults to minimum brightness and has to be manually changed.

So I followed advice here to install dconf-tools and set the backlight values there. I'm sure I could find the actual location of these values and do it without dconf, but that's a challenge for another day.

For mint mate 17, you can set the default brightness by following steps:
  • sudo apt-get install dconf-tools
  • Applications -> System Tools -> dconf tools,
  • search for backlight, find and change following options:
    • brightness-ac: brightness when use AC powser (charged),
    • brightness-dim-battery: brightness when use battery (not charged),



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