There is a new pull request by mmurphy2 against master on the void-packages repository

https://github.com/mmurphy2/void-packages master
https://github.com/void-linux/void-packages/pull/26068

New package: system76-dkms-1.0.9
Kernel driver for keyboard backlight and fan control on System76
branded laptops.

A patch file from https://github.com/void-linux/void-packages/pull/26068.patch is attached