Thanks for your reply. Now I have tried to use your ACPIKeyboard.kext and patch the DSDT refered to your README in https://github.com/RehabMan/OS-X-ACPI-Keyboard , it works well!
What do "0x0205" "0x0285" "0x0206" "0x0286" mean ? Do they differ from machine to machine ? I used the patch on my Lenovo G470, but it didn't work. I have determined that _Q11 is dimmer and _Q12 is brighter on my machine as well.
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