The missing function keys are due to the fact that Samsung
N150/N210/N220 are missing from the udev rules:

/lib/udev/rules.d/95-keymap.rules
/lib/udev/rules.d/95-keyboard-force-release.rules

adding "|*N150/N210/N220*" to the product part of the rules for Samsung
in BOTH files, will enable the Fn-up and Fn-down keys. The new product
section will look like:

ENV{DMI_VENDOR}=="[sS][aA][mM][sS][uU][nN][gG]*",
ATTR{[dmi/id]product_name}=="*NC10*|*NC20*|*N130*|*SP55S*|*SQ45S70S*|*SX60P*|*SX22S*|*SX30S*|*R59P/R60P/R61P*|*SR70S/SR71S*|*Q210*|*Q310*|*X05*|*P560*|*R560*|*N150/N210/N220*"

Now, you can map these keys to any program setting the backlight (see:
http://ubuntuforums.org/showthread.php?t=1397371 post no #)

-- 
SAMSUNG N150 Laptop : Brightness issue
https://bugs.launchpad.net/bugs/574250
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