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I have Kubuntu 13.04 installed on an HP envy DV7 with the dual graphics chipsets intel 4000 and Nvidia 630M. And when I try to reduce my screen brightness it doesn´t actually go down until it reaches 10%. I´m running the standard nouveau drivers, no proprietary drivers.

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Nvidia 630M is a chipset with CUDA ? Here is problem with CUDA (and Optimus) solved :… – dschinn1001 Oct 4 '13 at 11:10
up vote 2 down vote accepted

Try it once.. It has solved all problems about brightness! Including mine!!

  • Open terminal ( Ctrl+Alt+T ) and type:

    sudo cp /etc/default/grub /etc/default/grub.bak
    sudo gedit /etc/default/grub

    You will find this line in the new opened window: GRUB_CMDLINE_LINUX_DEFAULT="quiet splash"

  • Change it to:

    GRUB_CMDLINE_LINUX_DEFAULT="quiet splash acpi_backlight=vendor"
  • Save and close the window and type this in the terminal:

    sudo update-grub
  • Restart your system..

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you da man!!!!! – Frank Barcenas Oct 4 '13 at 16:09

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