How to control brightness for ubuntu 16.04 after installing Nvidia Driver

I am using the Thinkpad w530 with k1000m. I can not control the brightness after installing the official driver from Nvidia.

# sudo gedit /usr/share/X11/xorg.conf.d/10-nvidia-brightness.conf

And copy these lines to the file

Section "Device"
    Identifier     "Device0"
    Driver         "nvidia"
    VendorName     "NVIDIA Corporation"
    BoardName      "Quadro K1000M"
    Option         "RegistryDwords" "EnableBrightnessControl=1"
EndSection

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