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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