VoodooPS2Keyboard maps two PS2 keys to the same value

[wolf606]

So the bug is simple. Given a laptop with a Latin American keyboard, the PS2/ADB mapping changes out of the blue. The <> key starts to behave like the |°¬ key.

Turning on the property ApplePS2Keyboard LogScanCodes 1 shows that the mapping is indeed correct as it was written in the ApplePS2ToADBMap.h file.

[ 1245.364541]: ApplePS2Keyboard: sending key 29=32 down
[ 1246.031641]: ApplePS2Keyboard: sending key 56=a down

However, when pressing the key 56, it behaves as if the key 32 was pressed.

It is a fairly common occurrence and I have not identified the cause yet. The problem persists even after rebooting. Even after changing the keyboard layout in System Preferences, key 56 behaves exactly like key 32.

This morning I was trying to map the keys manually while the problem was occurring, but around 3 PM in the afternoon, it went back to normal. After I noticed the change, I replaced the modified kext with the original release and it still works, but after some time it will break again.

This bug happens to me on two platforms: a Coffe Lake ASUS laptop and a Sky Lake Lenovo laptop. The ASUS laptop was running macOS Big Sur back in 2020 when it was first released, it's not mine so I don't have the hardware anymore. The Lenovo laptop it's the current device I use.

Lenovo Ideapad 500 - 14ISK 6 GB of DDR3 RAM @ 1600 Mhz Intel Core i5 6200U Intel HD Graphics 520

OpenCore 0.9.3 macOS 12.6.7 (21G651) Lilu 1.6.6 VoodooPS2 2.3.5

OC.zip

[vit9696]

If the hardware gives us the same scan code, not much we can do. Perhaps there is a way to access the keyboard through some other proprietary protocol (not PS/2).