Error: command ['systemctl', 'status', '--full', 'systemd-backlight@backlight:acpi_video0.service'] failed with exit code 3: ● systemd-backlight@backlight:acpi_video0.service - Load/Save Screen Backlight Brightness of backlight:acpi_video0
   Loaded: loaded (/lib/systemd/system/systemd-backlight@.service; static; vendor preset: enabled)
   Active: failed (Result: exit-code) since Ср. 2015-04-29 15:48:07 MSK; 1h 28min ago
     Docs: man:systemd-backlight@.service(8)
 Main PID: 442 (code=exited, status=1/FAILURE)

апр. 29 15:48:07 iv-pc systemd[1]: Starting Load/Save Screen Backlight Brightness of backlight:acpi_video0...
апр. 29 15:48:07 iv-pc systemd[1]: systemd-backlight@backlight:acpi_video0.service: main process exited, code=exited, status=1/FAILURE
апр. 29 15:48:07 iv-pc systemd[1]: Failed to start Load/Save Screen Backlight Brightness of backlight:acpi_video0.
апр. 29 15:48:07 iv-pc systemd[1]: Unit systemd-backlight@backlight:acpi_video0.service entered failed state.
апр. 29 15:48:07 iv-pc systemd[1]: systemd-backlight@backlight:acpi_video0.service failed.