I have also been trying to fix this problem on my new Samsung NC10 Plus - which under the bonnet is just a N150
I'm running Ubuntu (full version - not the netbook version) - Maverick 10.10 Kernel 2.6.35-25-generic
Samsung Tools 1.3.2 - I guess that is the latest version since I installed it only yesterday night.
The command I use to install the packages was
sudo apt-get install samsung-tools samsung-backlight easy-slow-down-manager
I then found in this thread the bit of information "acpi_backlight=vendor
I could now change the brightness level - thanks for that
However, I soon noticed the flickering problem..... it seems like something was trying to reduce brightness and another process trying to put it back on. I could overcome this by simply visiting another workspace
I then tried what "NANDERS" posted, disabling the dim the screen option when idle from power management.
...... and so far that seems to have done the trick. No more issues.
So I have not tried the latest workaround suggested by "ignasiogarcia" but I wanted to leave here this information for those that are still looking for a solution to the problem and also those who are working on a solution.