I have a "Samsung n150" and running Lucid and  the problem is the same :
no brightness control.

smartdimmer command doen't  work here ...
output:
init_nvclock() failed!

instead that works good:

setpci -s $DEVICE F4.B=$var2

with:
- DEVICE=00:02.0
and
- var2=`echo "ibase=10; obase=16; a=($var1d+$AMOUNT);if (a<255) print a else 
print 255" | bc`
               echo "$0: increasing brightness from 0x$var1 to 0x$var2"

-- 
no brightness-control on samsung laptop
https://bugs.launchpad.net/bugs/212800
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