Bug#824898: Failed to start Load/Save Screen Backlight Brightness of backlight

[Mark]

Package: systemd
Version: 229-5

Right after start I saw on tty1:

[FAILED] Failed to start Load/Save Screen Backlight Brightness of 
backlight:acpi_video0.
See 'systemctl status systemd-backlight at backlight:acpi_video0.service' 
for details.

So let us see the output of the aforementioned command:

● systemd-backlight at backlight:acpi_video0.service - Load/Save Screen 
Backlight Brightness of backlight:acpi_video0
    Loaded: loaded (/lib/systemd/system/systemd-backlight at .service; 
static; vendor preset: enabled)
    Active: failed (Result: exit-code) since Sa 2016-05-21 01:35:26 
CEST; 1min 24s ago
      Docs: man:systemd-backlight at .service(8)
   Process: 1688 ExecStart=/lib/systemd/systemd-backlight load %i 
(code=exited, status=1/FAILURE)
  Main PID: 1688 (code=exited, status=1/FAILURE)

Mai 21 01:35:26 examplehost systemd[1]: Starting Load/Save Screen 
Backlight Brightness of backlight:acpi_video0...
Mai 21 01:35:26 examplehost systemd[1]: 
systemd-backlight at backlight:acpi_video0.service: Main process exited, 
code=exited, status=1/FAILURE
Mai 21 01:35:26 examplehost systemd[1]: Failed to start Load/Save Screen 
Backlight Brightness of backlight:acpi_video0.
Mai 21 01:35:26 examplehost systemd[1]: 
systemd-backlight at backlight:acpi_video0.service: Unit entered failed state.
Mai 21 01:35:26 examplehost systemd[1]: 
systemd-backlight at backlight:acpi_video0.service: Failed with result 
'exit-code'.

The dmesg is attached. Let us look at the files:
$ ls -la /lib/systemd/system/systemd-backlight at .service
-rw-r--r-- 1 root root 724 Apr 25 11:32 
/lib/systemd/system/systemd-backlight at .service
$ ls -la /lib/systemd/systemd-backlight
-rwxr-xr-x 1 root root 92752 Apr 25 11:32 /lib/systemd/systemd-backlight

Any bug fix?
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