I have an Asus G55VW and backlight hotkeys do not work and neither does
trying to directly manipulate /sys/class/backlight ... I have tried
adding "Option "RegistryDwords" "EnableBrightnessControl=1""  and
changing the kernel boot params but with no success.

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https://bugs.launchpad.net/bugs/562005

Title:
  Backlight controls of laptops with NVIDIA NVS and Quadro FX 880M GPUs
  no longer function while using proprietary drivers

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