[SOLVED] Failed to start Load/Save Screen Backlight Brightness

添加下列内容到/etc/default/grub

GRUB_CMDLINE_LINUX_DEFAULT="quiet acpi_backlight=vendor"

更新grub

sudo grub-mkconfig -o /boot/grub/grub.cfg

参考网址：

https://wiki.archlinux.org/index.php/backlight

https://wiki.archlinux.org/index.php/Kernel_parameters

https://bbs.archlinux.org/viewtopic.php?id=211967