[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 #3 from Rong Zhang (i@rong.moe) ---
(In reply to George from comment #2)
> HALS: 0x0000ca40

Your device reports itself as no keyboard backlight support.

> 
> 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.

Sorry, I meant you would need to check for content changes each time Fn+Space
is pressed, i.e., Off → Low, Low → High, High → Off.

> I have attached `acpidump.txt.gz`.

The HALS method seems to lack keyboard backlight stuff. But the SALS method can
be used to set a two-level backlight brightness (off, on), interesting. No
other ACPI method for keyboard backlight is found.

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