GRUB_CMDLINE_LINUX_DEFAULT='quiet splash acpi_osi=' I have edited the grub file as below and after updating grub I've done a reboot. Specifically, I have followed the many suggestions that were recommended from this link with no luck.
Specifically the key combinations for adjusting keyboard backlight for my model FN+F3 to dim and FN+F4 to brighten. Some of the F# keys do not respond their dedicated function when holding the Fn key. I'm having quite the time getting my keyboard backlights to work on my ROG Zephyrus laptop.
