[Bug 221583] 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

--- Comment #2 from George (george.stafilidis@proton.me) ---
Created attachment 310234
  --> https://bugzilla.kernel.org/attachment.cgi?id=310234&action=edit
acpidump

Hi Rong,

I checked `/sys/kernel/debug/ideapad/`.

Directory contents:

```text
$ sudo ls -l /sys/kernel/debug/ideapad
total 0
-r--r--r--. 1 root root 0 Jun 1 17:23 cfg
-r--r--r--. 1 root root 0 Jun 1 17:23 status
```

These are the only files present:

```text
$ sudo find /sys/kernel/debug/ideapad -type f
/sys/kernel/debug/ideapad/status
/sys/kernel/debug/ideapad/cfg
```

Contents of `cfg`:

```text
_CFG: 0xfe0d0018

Capabilities: bluetooth wifi camera
OSD support: num-lock caps-lock mic-mute touchpad camera
Graphics:
```

Contents of `status`:

```text
Backlight max: 21
Backlight now: 17
BL power value: on (1)
=====================
Radio status: off (0)
Wifi status: off (0)
BT status: off (0)
3G status: off (0)
=====================
Touchpad status: on (1)
Camera status: on (1)
=====================
GBMD: 0x10060020
HALS: 0x0000ca40
```

I cycled the keyboard backlight through all states using Fn+Space (Off → Low →
High → Off), then compared the contents of both files before and after:

```text
$ diff -u ~/cfg-before.txt ~/cfg-after.txt
$ diff -u ~/status-before.txt ~/status-after.txt
```

Both commands produced no output.

I have attached `acpidump.txt.gz`.

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