Reverse Engineering RGB Keyboard Backlights With Linux Kernel Drivers
summary
Reverse engineers a closed-source HP Omen 4‑zone RGB system with ILSpy to extract WMI GUIDs and the integer opcodes, uses IASL to decompile ACPI AML and maps the WMI GUID to ACPI method AA, then implements a Linux kernel driver calling acpi_wmi_evaluate_method from acpi.h, exposes /sys/class/leds/HP_Omen_keyboard_backlight with brightness and zone files, and ships a working patch to mainline; demo shows per‑zone color streaming and a software brightness hack that scales RGB bytes to simulate multiple levels.
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chapters (6)
- 0:00Speaker and Talk Introduction
- 1:37Chapter 1: Reverse Engineering the HP Light Studio Application
- 9:22Chapter 2: Understanding ACPI and WMI
- 19:55Chapter 3: Developing WMI Drivers on the Linux Kernel
- 25:34Demo
- 29:16Q&A
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