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Hi @Hervé, as you point out above I actually went through the process of instrumenting and tracing the ACPI Methods involved when I originally configured my laptop. I followed Rehabman's guides on his repo and elsewhere on the web. From the info I still have the exact sequence is (Q66 - NEVT - SMIE - SMEE - EV5 - BRT6) which only applies to the method under IGPU. For the sequence to reach BRT6 the OS Check Fix for "Darwin" has to be applied to the appropriate _OSI checks under both Method _INI and Method OSID otherwise the firmware will take control of brightness. The VoodooPS2Controller.kext driver has a feature originally implemented by Rehabman that can receive hex codes through ACPI and translate to PS2/ADB codes and associated functions. You can find more about it by searching the patch codes. I would have responded sooner but I had to dump the ACPI tables and go through the patching process to create a DSDT. I've been using Rehabman's hotpatch/SSDT method for over a year and didn't have one. Have a look at the attached files and see if they work for you. E6230_DSDT.zip