Systemctl-failed: systemd-backlight

After starting the system, this message is displayed on a LENOVO T14s (AMD, 1st. Gen):

$ systemctl --failed
  UNIT                                            LOAD   ACTIVE SUB    DESCRIPTION                                                   
ā— systemd-backlight@backlight:acpi_video0.service loaded failed failed Load/Save Screen Backlight Brightness of backlight:acpi_video0

From Arch-Wiki I tried adding acpi_backlight= into in /etc/default grub:

  • Added acpi_backlight=vendor: Brightness always minimum (ref. here),
  • Added acpi_backlight=video: Brightness always maximum.

How to get rid of that message?

Now I added acpi_backlight=none instead of the above and after reboot got these results:

$ $ systemctl --failed
0 loaded units listed.

Brigthness can be changed properly using

  • keys F5/F6
    and as well
  • SystemSettings > Hardware > Energy > Brightness.

Everything seems to fine right now.

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