[Bug 2060422] Re: Avoid creating non-working backlight sysfs knob from ASUS board

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

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

Status in HWE Next:
New
Status in linux package in Ubuntu:
Fix Committed
Status in linux source package in Jammy:
Fix Committed
Status in linux source package in Mantic:
Fix Committed
Status in linux source package in Noble:
Fix Committed

Bug description:
[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.

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