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Fix Ubuntu brightness keys

Fix Brightness Enabling Laptop Specific Drivers

  • Open the file /etc/default/grub using gedit or any other text editor.
    Find below line.
GRUB_CMDLINE_LINUX_DEFAULT="quiet splash"
  • Change above line to
GRUB_CMDLINE_LINUX_DEFAULT="quiet splash acpi_backlight=vendor"
grub update for brightness control
grub update for brightness control
This would ensure to load device specific drivers before default drivers in Linux.
  • Save the file and close text editor.
  • Open terminal and run below command.
update-grub
  • Reboot.
After reboot, try adjusting brightness using Laptop dedicated control keys.
brightness-control-via-oem-keys

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