Brightness Adjustment of Samsung Ativ Book 9 in Ubuntu 13.10

It seems that you can't adjust the brightness of this notebook using the function key Fn+F3 or Fn+F4 in Ubuntu 13.10. Even after you've set the additional kernel parameters to enable it as shown.

Edit /etc/default/grub and modify the GRUB_CMDLINE_LINUX_DEFAULT as shown.Before that, always save a backup copy so we can revert back in case we mess up somehow.
$ sudo cp /etc/default/grub /etc/default/grub.20140302
$ sudo vi /etc/default/grub
GRUB_CMDLINE_LINUX_DEFAULT = "quiet splash = acpi_osi Linux acpi_backlight = vendor "

$ sudo update-grub 
$ sudo reboot

Check the kernel parameter again.
$ cat /proc/cmdline
BOOT_IMAGE=/boot/vmlinuz-3.11.0-17-generic.efi.signed root=UUID=a3f6d437-64e9-4379-be8f-b96438dbf677 ro quiet splash acpi_osi=Linux acpi_backlight=vendor vt.handoff=7

Which in the end you still need to use AMD Catalysit Control Center to reduce the brightness so I can extend the battery life.
$ sudo apt-get install gksu
$ gksudo /usr/lib/fglrx/bin/amdcccle

Go to Color (1) and adjust the Brightness (2) using the slider under the Adjustment section. See screenshot below.

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