I have the same issue but entering the BIOS I cannot find any button to add back light..
Suddenly my Backlight power off and now I'm using an external display, sometimes on external monitor I can see some flickering or illumination changes...
By original keybard pressing F11 or F12 UI can see the illumination bar active, but nothing is changing. Max illumination = Zero illumination.
Thanks in advance
Salmec...
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