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

This bug is awaiting verification that the linux-
nvidia-6.8/6.8.0-1008.8~22.04.1 kernel in -proposed solves the problem.
Please test the kernel and update this bug with the results. If the
problem is solved, change the tag 'verification-needed-jammy-linux-
nvidia-6.8' to 'verification-done-jammy-linux-nvidia-6.8'. If the
problem still exists, change the tag 'verification-needed-jammy-linux-
nvidia-6.8' to 'verification-failed-jammy-linux-nvidia-6.8'.


If verification is not done by 5 working days from today, this fix will
be dropped from the source code, and this bug will be closed.


See https://wiki.ubuntu.com/Testing/EnableProposed for documentation how
to enable and use -proposed. Thank you!


** Tags added: kernel-spammed-jammy-linux-nvidia-6.8-v2 verification-needed-jammy-linux-nvidia-6.8

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

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 Released
Status in linux source package in Mantic:
Fix Committed
Status in linux source package in Noble:
Fix Released

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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