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I have opened terminal and tried the following commands.

sudo nano /etc/default/grub

I entered my password.

Found

GRUB_CMDLINE_LINUX_DEFAULT="quiet splash"

and change it to say

GRUB_CMDLINE_LINUX_DEFAULT="quiet splash acpi_backlight=vendor"

Press Ctrl+O to save and Ctrl+X to exit.

Then I type

sudo update-grub

But that didn't help, any advice?

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