For ThinkPad T410 with nvidia driver for NVS 3100M the solution in #4 works 
(Linux Mint 12 (lisa), Edition: Gnome 64-bit)
Section in /etc/X11/xorg.conf

Section "Device"
    Identifier     "Device0"
    Driver         "nvidia"
    VendorName     "NVIDIA Corporation"
    BoardName      "NVS 3100M"
    Option         "RegistryDwords" "EnableBrightnessControl=1"
EndSection

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https://bugs.launchpad.net/bugs/776590

Title:
  [Lenovo Thinkpad T410] Brightness keys do not change brightness

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