Go to the tab, click the property dropdown, and select Hardware Ids to confirm it says ACPI\FNBT0000 .

: Download and install the Lenovo Yoga Mode Control or the Lenovo Advanced Configuration and Power Management (ACPI) Driver .

Lenovo frequently uses this configuration for their system interface foundations.

The FNBT0000 hardware ID is almost exclusively tied to or custom power management modules on specific laptop brands—most notably Lenovo (such as ThinkPad, IdeaPad, or Yoga series) and certain HP or Toshiba notebooks.

Q: What is the ACPI FNBT0000 0 driver used for? A: The ACPI FNBT0000 0 driver is used for managing power consumption and configuring hardware components on a computer.

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If this driver is missing, you can resolve the issue through the following steps:

The "ACPI\FNBT0000" identifier is almost exclusively linked to the Lenovo Fn and Function Keys driver. This driver acts as the bridge between your physical keyboard and the Windows software, ensuring that your F1-F12 keys perform their intended secondary functions—like adjusting brightness, toggling Wi-Fi, or changing volume. Without this driver, your laptop may experience: Unresponsive function keys (Fn). Inability to toggle Airplane Mode via the keyboard.

If the yellow exclamation mark remains after trying the steps above, follow these final troubleshooting measures:

If you're still concerned, consider these final steps:

I think it stands for something older.