Brightness is not varying. The screen is seemed to be in maximum brightness. Help me somebody please.
1 Answer
1.Open file sudo gedit /etc/default/grub
2.There will be something like: GRUB_CMDLINE_LINUX_DEFAULT="quiet splash".
Change it to
GRUB_CMDLINE_LINUX_DEFAULT="quiet splash acpi_backlight=vendor"
3.Save file
4.Run command
sudo update-grub
5.Reboot