Samsung NF210 Brightness not working

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http://crunchbang.org – I have a Samsung NF210 and while the Fn-Brightness keys are registering (that is the brightness pop-up with the amount of brightness bar is showing and changing) the actual brightness is not changing. Volume works fine.I have tried addingacpi_osi=linuxto grub as suggested by another post with a similar, but not exact, laptop. However that didn't work.  It has worked with very recent versions of Fedora and Ubuntu, but in fairness overall many distros have problems with this particular laptop.Any tips on troubleshooting or solving this issue?Thanks much!Ace (HowTos)