Ubuntu fixing screen backlight brightness toggle

For quite some time, my primary Ubuntu laptop has had a problem with the keyboard keys used to adjust the screen brightness. This had been an annoyance on some of my travels where I’d wanted to extend battery life, as well as when I prefer to work in a darker space. I knew that it had to be a software driver issue of some sort, as it worked in my sometimes used dual boot Windows environment, but I’d never been bothered enough to look for a solution.

Truth is, it only took a minute or two to fix this!

  1. Modify the grub boot loader.
    sudo vi /etc/default/grub
  2. Change the line from:
    GRUB_CMDLINE_LINUX=""
    to
    GRUB_CMDLINE_LINUX="quiet splash acpi_osi=Linux acpi_backlight=vendor"
  3. Update the loader:
    sudo update-grub
  4. Reboot and you should be good to go!

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