Keyboard Backlight not working Asus N752VX

[adultano]

Hi - I struggle with my keyboard backlight. I have an Asus N752 laptop with Skylake Intel Core i7-6700HQ and Intel HD 530 1920 x 1080 IGPU. I use OpenCore and Big Sur. Everything else works, e.g. screen brightness with FN Keys and all other FN Keys. I dual boot with Windows 10, there keyboard backlight works. I also fake ALS since it's not built in. In Keyboard settings I see backlight available. I unticked "adjust brightness in low light" and the scroll bar is available in command center. Could someone support me? Let me know what further information / files are needed. Thanks in advance.

[adultano]

Found a the solution meanwhile. Works with Big Sur

[Ubsefor]

Please, do not just close the issue without describing how you managed to fix it. It could help others with the same problem.

[adultano]

Sure - sorry. Let me try to explain then. My system was already working fine, Dual Boot Win 10 and Big Sur through OpenCore. Except keyboard brightness everything was working. I tried to dig deeper and failed a little over two days now. LabTick didn't work, Karabiner didn't work although my keyboard was recognized to be compatible (in system preferences -> keyboard, I had the brightness options available). I also tried additional kexts like AppleBacklightInjector. No success. The solution in the end was to add another SSDT patch (see below) and map the correct number for CI0.LPCB.EC0.WRAM (0x04B1, Arg0). This I gathered through MaciASL under SLKB. I stored this in .aml in ACPI in EFI and made sure it gets added in config.plist. I have a fully functional 16 step keyboard backlight now.

.aml which i added:

DefinitionBlock ("", "SSDT", 2, "hack", "AsusSMC", 0x00000000) { External (SB.ATKD, DeviceObj) // (from opcode) External (SB.PCI0.LPCB.EC0.WRAM, MethodObj) // 2 Arguments (from opcode)

Scope (_SB.ATKD)
{
    Method (SKBV, 1, NotSerialized)
    {
        ^^PCI0.LPCB.EC0.WRAM (0x04B1, Arg0)
        Return (Arg0)
    }
}

}

Hope this helps....