Cannot change brightness setting using function button or the brightness

I'm got new machine from new workplace, It's HP Probook. It's look quite good but I have got a problem about changing screen brightness doesn't work. So I google and found this https://askubuntu.com/questions/332657/cannot-change-brightness-setting-using-function-buttons-or-using-the-brightness, This blog put me through that problem. So this is my note

  • sudo vi /etc/default/grub
    • for this var GRUB_CMDLINE_LINUX="", set value "acpi_backlight=vendor"
  • sudo update-grub
  • restart then , yeh, many thanks for https://askubuntu.com/users/183206/aaditya-bagga

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