sudo gedit /etc/default/grub
GRUB_CMDLINE_LINUX=""
GRUB_CMDLINE_LINUX="acpi_osi=Linux"
sudo update-grub
GRUB_CMDLINE_LINUX_DEFAULT="quiet splash"
GRUB_CMDLINE_LINUX_DEFAULT="quiet splash acpi_backlight=vendor"
sudo update-initramfs -usudo update-grub