添加下列內容到/etc/default/grub
GRUB_CMDLINE_LINUX_DEFAULT="quiet acpi_backlight=vendor"
更新grub
sudo grub-mkconfig -o /boot/grub/grub.cfg
參考網址：
https://wiki.archlinux.org/index.php/backlight
[SOLVED] Failed to start Load/Save Screen Backlight Brightness
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