The entire USB hardware of that laptop is implemented extremely weird. It's all related to the "ATK" drivers.
Mine came with ATK version ending in 44 preinstalled. When i realized keyboard backlight didn't work until Windows had started booting, and then had to be manually switched on every time (after reboot), i contacted support.
They told me to uninstall ATK 44 and linked me a version 43. After i uninstalled 44 and rebooted (before installing 43) i noticed the backlight stayed on even past the reboot.
So, the USB device controlling that light (and the rear led lights for that matter) is not properly controlled by the UEFI firmware / BIOS.
I would have accepted the backlight being stuck on the "on" state and being unable to control it, that is what happens if you uninstall ATK while it is on,
sadly this also means touchpad gestures (also by ATK) do not work. So i cant scroll without them. BAAAAD.
Now, there is also newer versions of ATK drivers available (i believe i have 47 right now) if you dig around for them ... well atleast my keyboard won't forget the backlight setting anymore, however it still doesn't turn on until windows has booted.
Want more USB shenanigans? Try shutting down the laptop while an external USB keyboard is attached.
When you boot next time, the integrated keyboard won't work in UEFI/BIOS. If you have a UEFI or HDD password, you're **** out of luck.
The only solution is to plug in a USB keyboard to get past password prompts with.
The keyboard/touchpad/lights are essentially invalid USB devices which can be left in a broken state by the ATK drivers.