Keyboard backlight not working after RMA service

  1. System: ZenBook Pro Duo
  2. Battery or AC: Either
  3. Model: UX581GV
  4. Frequency of occurrence: Always
  5. Reset OS: Yes
  6. Screenshot or video:

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Detailed description:

After sending my laptop in for RMA service (which took a month) because the battery died after six months, the keyboard backlight does not work. I have tried EVERYTHING. I'm on the latest BIOS, I've reset BIOS defaults, reset Windows, tried different version of System Control Interface V2 and ScreenPad drivers. I took the case apart to confirm that the keyboard backlight ribbon cable is connected to the motherboard (it was). All other hotkeys work, and the F7 key works in a test program. There is no on-screen popup when I press (Fn+)F7 to adjust the backlight (I'm pretty sure there used to be). It seems like this has to be a software issue, but I've tried ALL possible drivers, and this definitely worked before the RMA. Can anyone confirm whether I should see an on-screen popup when trying to adjust the keyboard backlight? I do not want to send this in for repair again and be without the laptop for another month.

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