System76 ACPI Driver

modulename: system76_acpi.ko

configname: CONFIG_SYSTEM76_ACPI

Linux Kernel Configuration
└─>Device Drivers
└─>X86 Platform Specific Device Drivers
└─>Hardware Monitoring support
└─>System76 ACPI Driver
In linux kernel since version 5.1 (release Date: 2019-05-05)  
This is a driver for System76 laptops running open firmware. It adds
support for Fn-Fx key combinations, keyboard backlight, and airplane mode
LEDs.

If you have a System76 laptop running open firmware, say Y or M here.

source code:
drivers/platform/x86/system76_acpi.c