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
Status in HWE Next:
New
Status in linux package in Ubuntu:
Confirmed
Status in linux source package in Jammy:
Confirmed
Status in linux source package in Mantic:
Confirmed
Status in linux source package in Noble:
Confirmed
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.
To manage notifications about this bug go to:
https://bugs.launchpad.net/hwe-next/+bug/2060422/+subscriptions
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