Lenovo Legion 5 Pro display brightness not working

Alright, I edited it like this:

Vortic:~ $ cat /etc/default/grub
GRUB_DEFAULT=saved
GRUB_TIMEOUT=5
GRUB_TIMEOUT_STYLE=hidden
GRUB_DISTRIBUTOR="Manjaro"
GRUB_CMDLINE_LINUX_DEFAULT="quiet splash usbcore.autosuspend = -1 idle = nomwait resume=UUID=b682322c-7788-4d26-b501-4103a30fa493 resume_offset=104855552 amdgpu.backlight=0 acpi_backlight=video reboot=acpi"

Still not working, though.