Review the "Turn display off after" slider and increase the time duration. When you open your MacBook in a dim room and the keyboard fails to glow, the immediate concern is often a hardware malfunction.
Why Does My MacBook Keyboard Stay Dark: Common Settings Culprits
Understanding the intricate relationship between macOS settings and hardware sensors is the first step toward resolving this issue. Adjusting these sliders to longer intervals or disabling the "Enable Power Nap" option can often restore the backlight functionality by ensuring the system remains in a high-activity state.
However, the reality is that the backlight system is a sophisticated feature governed by software, sensors, and user settings. Check the "Automatically put displays to sleep" option and adjust accordingly.
Why Your MacBook Keyboard Stays Dark: Adjusting Settings
Similarly, the "Turn display off after" slider, if set to a minimal timeframe, can cause the screen and keyboard to deactivate rapidly. Check for updates via Apple Menu > System Settings > General > Software Update.
More About Why does my macbook keyboard not light up
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