Review the "Turn display off after" slider and increase the time duration. Boot into Safe Mode to determine if third-party software is causing the conflict.
Troubleshooting a MacBook Air Keyboard That Won't Illuminate
A corrupted preference file or a conflict within the macOS kernel can disrupt the communication between the keyboard and the logic board. When you open your MacBook in a dim room and the keyboard fails to glow, the immediate concern is often a hardware malfunction.
Ensuring the system is updated to the latest version of macOS is critical, as Apple frequently releases patches that address hardware driver issues. If the backlight is set to the lowest level, it may appear off in bright environments, creating the illusion of a complete failure.
Troubleshooting MacBook Air Keyboard Backlight Not Lighting Up
Many MacBook models utilize the F10 key to toggle the backlight on and off entirely. Energy Saver and Auto‑Display Settings Energy conservation features in macOS can directly interfere with keyboard visibility.
More About Why does my macbook keyboard not light up
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