Linux On My Samsung

so far so good.
beside the steps posted above there is one final step missing ;)
you have to add " acpi_backlight=vendor " to grub to get a working brightness control:

sudo gedit /etc/default/grub

add "acpi_backlight=vendor" to the line GRUB_CMDLINE_LINUX_DEFAULT
so it looks like: GRUB_CMDLINE ...