[Bug 221583] New: Lenovo 82KU: keyboard backlight works via Fn+Space but no kbd_backlight LED device exposed

[bugzilla-daemon@kernel.org]

https://bugzilla.kernel.org/show_bug.cgi?id=221583

            Bug ID: 221583
           Summary: Lenovo 82KU: keyboard backlight works via Fn+Space but
                    no kbd_backlight LED device exposed
           Product: Drivers
           Version: 2.5
          Hardware: All
                OS: Linux
            Status: NEW
          Severity: normal
          Priority: P3
         Component: Platform_x86
          Assignee: drivers_platform_x86@kernel-bugs.osdl.org
          Reporter: george.stafilidis@proton.me
        Regression: No

Laptop: Lenovo 82KU
Distribution: Fedora
Kernel: (paste output of uname -r)

Problem:
Keyboard backlight works correctly using Fn+Space
(Off -> Low -> High), but Linux exposes no keyboard
backlight LED interface.

No device appears under:
/sys/class/leds/

Expected behavior:
A standard LED interface such as:
platform::kbd_backlight
or
ideapad::kbd_backlight

Current result:
GNOME cannot expose keyboard backlight controls because
no LED device exists.

Tested:

* modprobe ideapad_laptop
* reboot
* latest Fedora updates

Outputs:

$ ls /sys/class/leds/
input18::capslock
input18::numlock
input18::scrolllock
input3::capslock
input3::numlock
input3::scrolllock
platform::fnlock

$ sudo dmidecode -s system-manufacturer
LENOVO

$ sudo dmidecode -s system-product-name
82KU

$ uname -r
7.0.10-200.fc44.x86_64

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