Ubuntu – How to fix Acer Aspire 4736z back light brightness control in Ubuntu 13.04

aceraspirebacklightbrightness

A simple way to fix Acer Aspire 4736z back light brightness control problem using hot keys (Fn + Brightness +-)

Best Answer

  • Open up the terminal and type

    sudo -H gedit /etc/default/grub
    

    Find this line:

    GRUB_CMDLINE_LINUX_DEFAULT=ā€¯quiet splash"
    

    Replace the line with this:

    GRUB_CMDLINE_LINUX_DEFAULT="acpi_osi=Linux acpi_backlight=vendor"
    

    Save the changes and close the editor then come back to the terminal and enter the below command to update the GRUB configuration:

    sudo update-grub
    

    Just reboot the machine.