I currently own two Samsung netbooks (an N150 Plus and an NF310). Following up on some information from Moley (thanks), I found that most Linux distributions have a lot of trouble with the display brightness control on both of them. The most obvious and severe symptom is that when running on battery power they will sometimes (often) suddenly start to run the display brightness all the way up and down its range continuously. Not nice. A secondary problem, not quite so severe, is that the Fn-key control for display brightness is often erratic, and on some distributions doesn't work at all.
I've been looking into this for several weeks now, trying to find a solution, or at least a reasonable work-around. Now, thankfully, I have found both. First, the solution -
rest here