1. vi /etc/default/grub
    3. GRUB_CMDLINE_LINUX="acpi_backlight=vendor"
    6. gedit /usr/share/X11/xorg.conf.d/10-nvidia.conf
    8. Section "Device"
    9.     Identifier "Device0"
    10.     Driver "nvidia"
    11.     VendorName "NVIDIA Corporation"
    12.     Option "RegistryDwords" "EnableBrightnessControl=1"
    13.     Option "Nologo""True"
    14. EndSection
    17. gedit /etc/modprobe.d/blacklist.conf
    19. blacklist ideapad_laptop