[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 #31 from George (george.stafilidis@proton.me) ---
Ok so I repeated the KBLO synchronization test.

First test:

Physical keyboard brightness was High.

sudo busybox devmem 0xFE00D42A 8
0x05

sudo busybox devmem 0xFE00D42A 8 0x03
sudo busybox devmem 0xFE00D48A 8 0x54
sudo busybox devmem 0xFE00D48A 8 0x55

Result:
The final command caused the keyboard backlight to turn on at Low brightness.

Second test:

sudo busybox devmem 0xFE00D42A 8 0x05
sudo busybox devmem 0xFE00D48A 8 0x54
sudo busybox devmem 0xFE00D48A 8 0x55

Result:
The final command again caused the keyboard backlight to turn on at Low
brightness.

So changing 0x2A before toggling 0x8A did not appear to affect the resulting
brightness. In both cases the keyboard came back at Low brightness. I am so
confused at this point I dont know if i am doing stuff the correct way.

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