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Ask HN: Debug Linux Hardware Issue?

I own an HP victus laptop, running Ubuntu 22.04 on it. The keyboard back-light can be switched on/off with an fn keyboard combination. I'd like to implement auto on/off, where the back-light switches on when any key is pressed and switches off after a specified duration. I already went to /sys/class/leds, none of the devices listed there effect changes on the back-light. How do I debug this?

GianFabien 3y ago
From your description I suspect that it is the keyboard controller that directly implements the functionality. It might not be exposed via ACPI. However, there might be a kernel module that implements that functionality. You might need to look into the Linux kernel sources. Another clue might be found in: https://wiki.archlinux.org/title/ACPI_modules https://wiki.archlinux.org/title/ACPI_modules