Thanks for the update, MoKiChu!Writing it to let You know, that some of Us still use this platform, even though its older and not much profitable - power consumption/performance etc... compare to new ones.You are the Man! Thanks again and keep it up.
Check this - https://rog.asus.com/forum/showthread.php?129310-ROG-Maximus-Z690-Extreme-onboard-LED-Stealth-Mode-in-new-1505-BIOS-not-settingYou can disable it only by Armoury Crate or bios settings. If You can't, then must be something wrong with you...