If the problem emerged after an update, performing a System Restore to a point before the update is a logical troubleshooting step that often resolves software-induced darkness. Check the "Automatically put displays to sleep" option and adjust accordingly.
Troubleshooting MacBook Keyboard Backlight Not Turning On at Night
Review the "Turn display off after" slider and increase the time duration. Understanding the intricate relationship between macOS settings and hardware sensors is the first step toward resolving this issue.
Many MacBook models utilize the F10 key to toggle the backlight on and off entirely. Manual Control and Function Key Interactions User-initiated commands play a significant role in the visibility of the keyboard.
Troubleshooting MacBook Keyboard Backlight Not Activating at Night
Software Updates and System Management Operating system glitches are a common culprit behind peripheral malfunctions. Ensure "Enable Power Nap" is disabled if it conflicts with background processes.
More About Why does my macbook keyboard not light up
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