Public bug reported:

[Impact]
Backlight sysfs knobs created by asus-wmi don't really work, hence
systemd-backlight services are in failed state.

[Fix]
Ensure the backlight device are really present

[Test]
With the fix applied, the backlight sysfs knobs are not longer present
under /sys/class/backlight, so there's no more failed systemd-backlight
service.

[Where problems could occur]
Though highly unlikely, but if there's working device that is created
even when the WMI read is 0xffffffff, the device will be missing.

** Affects: hwe-next
     Importance: Undecided
         Status: New

** Affects: linux (Ubuntu)
     Importance: Low
         Status: Confirmed

** Affects: linux (Ubuntu Jammy)
     Importance: Low
         Status: Confirmed

** Affects: linux (Ubuntu Mantic)
     Importance: Low
         Status: Confirmed

** Affects: linux (Ubuntu Noble)
     Importance: Low
         Status: Confirmed


** Tags: anle oem-priority originate-from-2031862

** Also affects: linux (Ubuntu Noble)
   Importance: Undecided
       Status: New

** Also affects: linux (Ubuntu Jammy)
   Importance: Undecided
       Status: New

** Also affects: linux (Ubuntu Mantic)
   Importance: Undecided
       Status: New

** Changed in: linux (Ubuntu Jammy)
       Status: New => Confirmed

** Changed in: linux (Ubuntu Mantic)
       Status: New => Confirmed

** Changed in: linux (Ubuntu Noble)
       Status: New => Confirmed

** Changed in: linux (Ubuntu Jammy)
   Importance: Undecided => Low

** Changed in: linux (Ubuntu Mantic)
   Importance: Undecided => Low

** Changed in: linux (Ubuntu Noble)
   Importance: Undecided => Low

** Tags added: anle oem-priority originate-from-2031862

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https://bugs.launchpad.net/bugs/2060422

Title:
  Avoid creating non-working backlight sysfs knob from ASUS board

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